$LSCC
Lattice Semiconductor Corp Stock $lscc

$lscc Overview Financials Valuation SEC Filings Company Website

2021 Q1 Form 10-K Financial Statement

#000143774921004238 Filed on February 26, 2021

Income Statement

Concept	2021 Q1	2019 Q4	2019 Q3
Revenue	$107.2M	$100.2M	$103.5M
YoY Change	10.16%	4.44%	1.96%
Cost Of Revenue	$42.30M	$40.90M	$42.03M
YoY Change	6.4%	-77.2%	-2.53%
Gross Profit	$64.90M	$59.29M	$61.44M
YoY Change	12.75%	9.18%	5.27%
Gross Profit Margin	60.54%	59.15%	59.38%
Selling, General & Admin	$24.50M	$20.90M	$21.08M
YoY Change	8.64%	-1.42%	-3.2%
% of Gross Profit	37.75%	35.25%	34.31%
Research & Development	$22.60M	$19.50M	$20.03M
YoY Change	4.18%	1.04%	4.71%
% of Gross Profit	34.82%	32.89%	32.6%
Depreciation & Amortization	$5.800M	$8.400M	$8.200M
YoY Change	-25.64%	-2.33%	-1.2%
% of Gross Profit	8.94%	14.17%	13.35%
Operating Expenses	$47.70M	$43.90M	$44.75M
YoY Change	-0.26%	-146.9%	-1.44%
Operating Profit	$17.20M	$15.39M	$16.69M
YoY Change	76.63%	-89.59%	28.78%
Interest Expense	-$800.0K	-$1.200M	$2.022M
YoY Change	-174.28%	-76.0%	-63.24%
% of Operating Profit	-4.65%	-7.8%	12.12%
Other Income/Expense, Net	-$100.0K	-$200.0K	-$61.00K
YoY Change	100.0%		-86.5%
Pretax Income	$16.40M	$14.10M	$14.61M
YoY Change	90.45%	-310.45%	108.43%
Income Tax	$400.0K	$100.0K	$1.100M
% Of Pretax Income	2.44%	0.71%	7.53%
Net Earnings	$16.00M	$13.99M	$13.54M
YoY Change	95.91%	-296.42%	94.14%
Net Earnings / Revenue	14.93%	13.95%	13.09%
Basic Earnings Per Share		$0.10	$0.10
Diluted Earnings Per Share	$112.0K	$0.10	$0.10
COMMON SHARES
Basic Shares Outstanding	136.5M	133.6M shares	132.7M shares
Diluted Shares Outstanding			138.9M

Balance Sheet

Concept	2021 Q1	2019 Q4	2019 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$182.3M	$118.1M	$97.41M
YoY Change	3.23%	-8.23%	-17.09%
Cash & Equivalents	$182.3M	$118.1M	$97.41M
Short-Term Investments		$0.00	$0.00
Other Short-Term Assets	$22.30M	$24.50M	$34.70M
YoY Change	16.75%	-11.87%	43.98%
Inventory	$64.60M	$54.98M	$59.67M
Prepaid Expenses
Receivables	$64.58M	$64.92M	$47.43M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$333.8M	$262.4M	$239.2M
YoY Change	4.76%	-7.73%	-15.67%
LONG-TERM ASSETS
Property, Plant & Equipment	$39.67M	$39.23M	$40.16M
YoY Change	-0.67%	12.46%	12.43%
Goodwill	$267.5M	$267.5M	$267.5M
YoY Change	0.0%	0.0%	0.0%
Intangibles	$6.321M	$6.977M	$10.38M
YoY Change	46.22%	-67.28%	-58.44%
Long-Term Investments
YoY Change
Other Assets	$10.55M	$11.80M	$11.35M
YoY Change	-4.73%	-23.04%	-43.98%
Total Long-Term Assets	$346.2M	$349.6M	$354.2M
YoY Change	0.2%	3.04%	1.59%
TOTAL ASSETS
Total Short-Term Assets	$333.8M	$262.4M	$239.2M
Total Long-Term Assets	$346.2M	$349.6M	$354.2M
Total Assets	$680.1M	$612.0M	$593.4M
YoY Change	2.39%	-1.87%	-6.16%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$27.53M	$44.35M	$29.60M
YoY Change	-38.0%	39.03%	12.98%
Accrued Expenses	$21.41M	$20.59M	$30.30M
YoY Change	-14.01%	-29.48%	13.06%
Deferred Revenue	$3.068M		$4.301M
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$12.76M	$21.47M	$17.20M
YoY Change	-40.6%	159.03%	21.92%
Total Short-Term Liabilities	$79.73M	$99.82M	$81.43M
YoY Change	-14.93%	43.79%	14.86%
LONG-TERM LIABILITIES
Long-Term Debt	$157.9M	$125.1M	$139.2M
YoY Change	-7.53%	-50.24%	-46.66%
Other Long-Term Liabilities	$39.07M	$38.03M	$40.62M
YoY Change	6.87%	-14.46%	3.42%
Total Long-Term Liabilities	$197.0M	$163.1M	$179.8M
YoY Change	-4.99%	-44.86%	-40.11%
TOTAL LIABILITIES
Total Short-Term Liabilities	$79.73M	$99.82M	$81.43M
Total Long-Term Liabilities	$197.0M	$163.1M	$179.8M
Total Liabilities	$295.6M	$284.4M	$283.8M
YoY Change	-7.97%	-22.14%	-23.56%
SHAREHOLDERS EQUITY
Retained Earnings	-$385.9M	-$433.3M	-$447.3M
YoY Change	-9.23%	-9.12%	-4.77%
Common Stock	$1.362M	$1.339M
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$384.4M	$327.7M	$309.6M
YoY Change
Total Liabilities & Shareholders Equity	$680.1M	$612.0M	$593.4M
YoY Change	2.39%	-1.87%	-6.16%

Cashflow Statement

Concept	2021 Q1	2019 Q4	2019 Q3
OPERATING ACTIVITIES
Net Income	$16.00M	$13.99M	$13.54M
YoY Change	95.91%	-296.42%	94.14%
Depreciation, Depletion And Amortization	$5.800M	$8.400M	$8.200M
YoY Change	-25.64%	-2.33%	-1.2%
Cash From Operating Activities	$22.70M	$39.30M	$18.30M
YoY Change	7.57%	27.18%	66.36%
INVESTING ACTIVITIES
Capital Expenditures	-$2.300M	-$3.900M	-$3.200M
YoY Change	-159.48%	77.27%	52.38%
Acquisitions
YoY Change
Other Investing Activities	-$1.800M	-$3.800M	-$2.200M
YoY Change	-35.71%	90.0%	-650.0%
Cash From Investing Activities	-$4.300M	-$7.700M	-$5.400M
YoY Change	-35.26%	83.33%	217.65%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-19.10M	-11.30M	-38.00M
YoY Change	-143.27%	-26.62%	-778.57%
NET CHANGE
Cash From Operating Activities	22.70M	39.30M	18.30M
Cash From Investing Activities	-4.300M	-7.700M	-5.400M
Cash From Financing Activities	-19.10M	-11.30M	-38.00M
Net Change In Cash	-700.0K	20.30M	-25.10M
YoY Change	-101.2%	79.65%	-268.46%
FREE CASH FLOW
Cash From Operating Activities	$22.70M	$39.30M	$18.30M
Capital Expenditures	-$2.300M	-$3.900M	-$3.200M
Free Cash Flow	$25.00M	$43.20M	$21.50M
YoY Change	45.05%	30.51%	64.12%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2021Q1	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2021Q1	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2021Q1	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	10000000
CY2019Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	10000000
CY2021Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	136532920
CY2021Q1	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2021Q1	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2019Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2019Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2021Q1	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2021Q1	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	300000000
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	300000000
CY2021Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	136236000
CY2021Q1	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	136236000
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	133883000
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	133883000
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2021	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	1	pure
CY2021	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	0	USD
CY2019	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	0	USD
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1	P4Y
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0
CY2019	lscc	Effective Income Tax Rate Reconciliation Federal Statutory Income Tax Rate Percent EffectiveIncomeTaxRateReconciliationFederalStatutoryIncomeTaxRatePercent	0.21	pure
CY2018	lscc	Effective Income Tax Rate Reconciliation Federal Statutory Income Tax Rate Percent EffectiveIncomeTaxRateReconciliationFederalStatutoryIncomeTaxRatePercent	-0.21	pure
CY2021	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	-0.04	pure
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.03	pure
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	-0.06	pure
CY2021	lscc	Effective Income Tax Rate Reconciliation Tax Credits Research Percent EffectiveIncomeTaxRateReconciliationTaxCreditsResearchPercent	-0.03	pure
CY2019	lscc	Effective Income Tax Rate Reconciliation Tax Credits Research Percent EffectiveIncomeTaxRateReconciliationTaxCreditsResearchPercent	0.03	pure
CY2018	lscc	Effective Income Tax Rate Reconciliation Tax Credits Research Percent EffectiveIncomeTaxRateReconciliationTaxCreditsResearchPercent	-0.05	pure
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.23	pure
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.11	pure
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.12	pure
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.02	pure
CY2021	lscc	Effective Income Tax Rate Reconciliation Other Deferred Tax Asset Adjustments Percent EffectiveIncomeTaxRateReconciliationOtherDeferredTaxAssetAdjustmentsPercent	0.03	pure
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	10084000	USD
CY2019	lscc	Effective Income Tax Rate Reconciliation Other Deferred Tax Asset Adjustments Percent EffectiveIncomeTaxRateReconciliationOtherDeferredTaxAssetAdjustmentsPercent	0	pure
CY2018	lscc	Effective Income Tax Rate Reconciliation Other Deferred Tax Asset Adjustments Percent EffectiveIncomeTaxRateReconciliationOtherDeferredTaxAssetAdjustmentsPercent	0.13	pure
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.13	pure
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.19	pure
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.11	pure
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.03	pure
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	408120000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	404093000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	398799000	USD
CY2021	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	162814000	USD
CY2019	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	165671000	USD
CY2018	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	179360000	USD
CY2021	us-gaap	Gross Profit GrossProfit	245306000	USD
CY2019	us-gaap	Gross Profit GrossProfit	238422000	USD
CY2018	us-gaap	Gross Profit GrossProfit	219439000	USD
CY2021	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	89223000	USD
CY2019	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	78617000	USD
CY2018	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	82449000	USD
CY2021	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	95331000	USD
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	82542000	USD
CY2018	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	91054000	USD
CY2021	lscc	Amortization Of Intangible Assets Acquired AmortizationOfIntangibleAssetsAcquired	4449000	USD
CY2019	lscc	Amortization Of Intangible Assets Acquired AmortizationOfIntangibleAssetsAcquired	13558000	USD
CY2018	lscc	Amortization Of Intangible Assets Acquired AmortizationOfIntangibleAssetsAcquired	17690000	USD
CY2021	us-gaap	Restructuring Charges RestructuringCharges	3937000	USD
CY2019	us-gaap	Restructuring Charges RestructuringCharges	4664000	USD
CY2018	us-gaap	Restructuring Charges RestructuringCharges	17349000	USD
CY2021	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	0	USD
CY2019	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	0	USD
CY2018	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	12486000	USD
CY2021	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	0	USD
CY2019	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	0	USD
CY2018	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	1531000	USD
CY2021	us-gaap	Operating Expenses OperatingExpenses	192940000	USD
CY2019	us-gaap	Operating Expenses OperatingExpenses	179381000	USD
CY2018	us-gaap	Operating Expenses OperatingExpenses	222559000	USD
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	52366000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	59041000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	-3120000	USD
CY2021	us-gaap	Interest Expense InterestExpense	3702000	USD
CY2019	us-gaap	Interest Expense InterestExpense	11731000	USD
CY2018	us-gaap	Interest Expense InterestExpense	20600000	USD
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-208000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-2245000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-249000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	48456000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	45065000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-23969000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1064000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1572000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2353000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	47392000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	43493000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-26322000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	23591000	USD
CY2021Q1	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	6321000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	6977000	USD
CY2021Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	22178000	USD
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.35
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.33
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.21
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.34
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.32
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.21
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	135220000
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	132471000
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	126564000
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	141276000
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	137274000
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	126564000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	47392000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	43493000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-26322000	USD
CY2021	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	1533000	USD
CY2019	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	341000	USD
CY2018	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-1271000	USD
CY2021	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	678000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	602000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-369000	USD
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	0	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	42000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	41000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	53000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	18000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	48247000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	43221000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-27201000	USD
CY2021Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	182332000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	118081000	USD
CY2021Q1	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	64581000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	64917000	USD
CY2021Q1	us-gaap	Inventory Net InventoryNet	64599000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	54980000	USD
CY2021Q1	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	22331000	USD
CY2019Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	24452000	USD
CY2021Q1	us-gaap	Assets Current AssetsCurrent	333843000	USD
CY2019Q4	us-gaap	Assets Current AssetsCurrent	262430000	USD
CY2021Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	39666000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	39230000	USD
CY2021Q1	us-gaap	Goodwill Goodwill	267514000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	267514000	USD
CY2021Q1	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	577000	USD
CY2019Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	478000	USD
CY2021Q1	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	9968000	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	11796000	USD
CY2021Q1	us-gaap	Assets Assets	680067000	USD
CY2019Q4	us-gaap	Assets Assets	612016000	USD
CY2021Q1	us-gaap	Accounts Payable Current AccountsPayableCurrent	27530000	USD
CY2019Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	44350000	USD
CY2021Q1	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	21411000	USD
CY2019Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	20591000	USD
CY2021Q1	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	18028000	USD
CY2019Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	13404000	USD
CY2021Q1	us-gaap	Long Term Debt Current LongTermDebtCurrent	12762000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	21474000	USD
CY2021Q1	us-gaap	Liabilities Current LiabilitiesCurrent	79731000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	99819000	USD
CY2021Q1	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	157934000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	125072000	USD
CY2021Q1	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	18906000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	21438000	USD
CY2021Q1	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	39069000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	38028000	USD
CY2021Q1	us-gaap	Liabilities Liabilities	295640000	USD
CY2019Q4	us-gaap	Liabilities Liabilities	284357000	USD
CY2021Q1	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2019Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2021Q1	us-gaap	Common Stock Value CommonStockValue	1362000	USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	1339000	USD
CY2021Q1	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	770711000	USD
CY2019Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	762213000	USD
CY2021Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-385898000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-433290000	USD
CY2021Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1748000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-2603000	USD
CY2021Q1	us-gaap	Stockholders Equity StockholdersEquity	384427000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	327659000	USD
CY2021Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	680067000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	612016000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	47392000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	43493000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-26322000	USD
CY2021	lscc	Depreciation Depletion And Amortization Excluding Right Of Use Asset And Finance Costs DepreciationDepletionAndAmortizationExcludingRightOfUseAssetAndFinanceCosts	25140000	USD
CY2019	lscc	Depreciation Depletion And Amortization Excluding Right Of Use Asset And Finance Costs DepreciationDepletionAndAmortizationExcludingRightOfUseAssetAndFinanceCosts	33056000	USD
CY2018	lscc	Depreciation Depletion And Amortization Excluding Right Of Use Asset And Finance Costs DepreciationDepletionAndAmortizationExcludingRightOfUseAssetAndFinanceCosts	39261000	USD
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	40372000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	18899000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	13646000	USD
CY2021	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	5960000	USD
CY2019	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	5797000	USD
CY2018	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	0	USD
CY2021	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	400000	USD
CY2019	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	1659000	USD
CY2018	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	2230000	USD
CY2021	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-0	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-2235000	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-0	USD
CY2021	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	0	USD
CY2019	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	977000	USD
CY2018	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	2370000	USD
CY2018	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	0	USD
CY2021	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	0	USD
CY2019	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	0	USD
CY2018	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	12486000	USD
CY2021	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	256000	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	374000	USD
CY2018	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	79000	USD
CY2021	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-336000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	4027000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	3978000	USD
CY2021	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	9619000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-12116000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-13177000	USD
CY2021	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	6441000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-3740000	USD
CY2018	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	11667000	USD
CY2021	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-16820000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	12470000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-3470000	USD
CY2021	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	5715000	USD
CY2019	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-3209000	USD
CY2018	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	16795000	USD
CY2021	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	4624000	USD
CY2019	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	4039000	USD
CY2018	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-1051000	USD
CY2021	lscc	Increase Decrease In Operating Lease Liabilities IncreaseDecreaseInOperatingLeaseLiabilities	-5715000	USD
CY2019	lscc	Increase Decrease In Operating Lease Liabilities IncreaseDecreaseInOperatingLeaseLiabilities	-6896000	USD
CY2018	lscc	Increase Decrease In Operating Lease Liabilities IncreaseDecreaseInOperatingLeaseLiabilities	0	USD
CY2021	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	599000	USD
CY2019	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	162000	USD
CY2018	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	498000	USD
CY2021	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	0	USD
CY2019	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	0	USD
CY2018	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	-68000	USD
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	91687000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	124137000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	51458000	USD
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	12121000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	15590000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	8384000	USD
CY2021	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	8747000	USD
CY2019	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	9601000	USD
CY2018	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	8123000	USD
CY2021	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	0	USD
CY2019	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	9655000	USD
CY2018	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	5000000	USD
CY2021	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	-0	USD
CY2019	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	-0	USD
CY2018	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	9603000	USD
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-20868000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-15536000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-21110000	USD
CY2021	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	26965000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	3054000	USD
CY2021	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	975000	USD
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	826000	USD
CY2018	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	110000	USD
CY2021	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	10103000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	17166000	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	29288000	USD
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	14989000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	-0	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	-0	USD
CY2021	us-gaap	Proceeds From Debt Net Of Issuance Costs ProceedsFromDebtNetOfIssuanceCosts	50000000	USD
CY2019	us-gaap	Proceeds From Debt Net Of Issuance Costs ProceedsFromDebtNetOfIssuanceCosts	206500000	USD
CY2018	us-gaap	Proceeds From Debt Net Of Issuance Costs ProceedsFromDebtNetOfIssuanceCosts	0	USD
CY2021	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	-0	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	2086000	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	-0	USD
CY2021	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	26250000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	321408000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	43759000	USD
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-8101000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-109912000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-16841000	USD
CY2021	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	1533000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	341000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	-1271000	USD
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	64251000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-970000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	12236000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	118081000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	119051000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	106815000	USD
CY2021Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	182332000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	118081000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	119051000	USD
CY2021	us-gaap	Interest Paid Net InterestPaidNet	3700000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	10995000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	18607000	USD
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	7713000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	8425000	USD
CY2018	us-gaap	Operating Lease Payments OperatingLeasePayments	0	USD
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	1868000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	3393000	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	2645000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	747000	USD
CY2018	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	245094000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-26322000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-879000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-27201000	USD
CY2018	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	26918000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	13646000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	258457000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	43493000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-272000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	43221000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	7082000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	18899000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	327659000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	47392000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	855000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	48247000	USD
CY2021	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-16862000	USD
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	40372000	USD
CY2021	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	14989000	USD
CY2021	lscc	Stock Issued During Period Value Treasury Stock Retired StockIssuedDuringPeriodValueTreasuryStockRetired	0	USD
CY2021Q1	us-gaap	Stockholders Equity StockholdersEquity	384427000	USD
CY2021	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-family: Arial; font-size: 9pt; margin: 0pt; text-align: left;">The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and judgments affecting the amounts reported in our consolidated condensed financial statements and the accompanying notes. The actual results that we experience <em style="font: inherit;"> may </em>differ materially from our estimates.</p> <p style="font-family: Arial; font-size: 9pt; margin: 0pt; text-align: left;"> </p> <p style="font-family: Arial; font-size: 9pt; margin: 0pt; text-align: left;">Certain prior year balances have been reclassified to conform to the current year’s presentation.</p>
CY2021	us-gaap	Fiscal Period FiscalPeriod	<p style="font-family: Arial; font-size: 10pt; margin: 0pt; text-align: left;"><b>Fiscal Reporting Periods</b></p> <p style="font-family: Arial; font-size: 10pt; margin: 0pt; text-align: left;"> </p> <p style="font-family: Arial; font-size: 9pt; margin: 0pt; text-align: left;">We report based on a <em style="font: inherit;">52</em> or <em style="font: inherit;">53</em>-week fiscal year ending on the Saturday closest to <em style="font: inherit;"> December 31. </em>Our fiscal <em style="font: inherit;">2020</em> was a <em style="font: inherit;">53</em>-week year that ended on <em style="font: inherit;"> January </em><em style="font: inherit;">2,</em> <em style="font: inherit;">2021.</em> Our fiscal <em style="font: inherit;">2019</em>, and <em style="font: inherit;">2018</em> were <em style="font: inherit;">52</em>-week years that ended on <em style="font: inherit;"> December 28, 2019</em> and <em style="font: inherit;"> December 29, 2018</em>, respectively. All references to quarterly or annual financial results are references to the results for the relevant fiscal period.</p>
CY2021	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<p style="font-family: Arial; font-size: 10pt; margin: 0pt; text-align: left;"><b>Concentrations of Risk</b></p> <p style="font-family: Arial; font-size: 10pt; margin: 0pt; text-align: left;"> </p> <p style="font-family: Arial; font-size: 9pt; margin: 0pt; text-align: left;">Potential exposure to concentrations of risk <em style="font: inherit;"> may </em>impact revenue, accounts receivable, and supply of wafers for our new products.</p> <p style="font-family: Arial; font-size: 9pt; margin: 0pt; text-align: left;"> </p> <p style="font-family: Arial; font-size: 9pt; margin: 0pt; text-align: left;">Distributors have historically accounted for a significant portion of our total revenue. Our <em style="font: inherit;">two</em> largest distributor groups, the Weikeng Group ("Weikeng") and Arrow Electronics, Inc. ("Arrow"), each account for more than <em style="font: inherit;">10%</em> of our total revenue and our net accounts receivable. Revenue attributable to distributors as a percentage of total revenue is presented in the following table:</p> <p style="font-family: Arial; font-size: 9pt; margin: 0pt; text-align: left;"> </p> <table cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 9pt; font-family: Arial, Helvetica, sans-serif; text-indent: 0px; margin-left: 0pt; margin-right: 0pt;"><tbody><tr style="background-color: rgb(255, 255, 255); vertical-align: bottom"><td style="font-family: Arial, Helvetica, sans-serif; font-size: 9pt; width: 44%;"> </td><td style="font-family: Arial, Helvetica, sans-serif; font-size: 9pt; padding-bottom: 1px; width: 1%;"> </td><td colspan="10" style="text-align: center; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt; width: 39%; border-bottom: 1px solid black;"> <p style="font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin: 0pt; text-align: center;"><b><em style="font: inherit;"><em style="font: inherit;"><em style="font: inherit;">Year Ended</em></em></em></b></p> </td><td style="font-family: Arial, Helvetica, sans-serif; font-size: 9pt; width: 1%; border-bottom: 1px solid black;"> </td></tr> <tr style="background-color: rgb(255, 255, 255); vertical-align: bottom"><td style="font-family: Arial, Helvetica, sans-serif; font-size: 9pt; width: 44%;"> </td><td style="font-family: Arial, Helvetica, sans-serif; font-size: 9pt; padding-bottom: 1px; width: 1%;"> </td><td colspan="2" style="text-align: center; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"><b><em style="font: inherit;">January 2, 2021</em></b></td><td style="font-family: Arial, Helvetica, sans-serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"> </td><td style="font-family: Arial, Helvetica, sans-serif; font-size: 9pt; padding-bottom: 1px; width: 2%;"> </td><td colspan="2" style="text-align: center; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"><b><em style="font: inherit;">December 28, 2019</em></b></td><td style="font-family: Arial, Helvetica, sans-serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"> </td><td style="font-family: Arial, Helvetica, sans-serif; font-size: 9pt; padding-bottom: 1px; width: 2%;"> </td><td colspan="2" style="text-align: center; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"><b><em style="font: inherit;">December 29, 2018</em></b></td><td style="font-family: Arial, Helvetica, sans-serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0); width: 1%;"> </td></tr> <tr style="background-color: rgb(204, 238, 255); vertical-align: bottom"><td style="font-family: Arial, Helvetica, sans-serif; font-size: 9pt; width: 44%;"> <p style="font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-top: 0pt; margin-bottom: 0pt;">Weikeng Group</p> </td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt;"> </td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt;"> </td><td style="width: 15%; text-align: right; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt;">35</td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt;">%</td><td style="width: 2%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt;"> </td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt;"> </td><td style="width: 15%; text-align: right; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt;">30</td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt;">%</td><td style="width: 2%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt;"> </td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt;"> </td><td style="width: 15%; text-align: right; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt;">25</td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt;">%</td></tr> <tr style="background-color: rgb(255, 255, 255); vertical-align: bottom"><td style="font-family: Arial, Helvetica, sans-serif; font-size: 9pt; width: 44%;"> <p style="font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-top: 0pt; margin-bottom: 0pt;">Arrow Electronics Inc.</p> </td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt;"> </td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt;"> </td><td style="width: 15%; text-align: right; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt;">25</td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt;"> </td><td style="width: 2%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt;"> </td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt;"> </td><td style="width: 15%; text-align: right; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt;">25</td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt;"> </td><td style="width: 2%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt;"> </td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt;"> </td><td style="width: 15%; text-align: right; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt;">29</td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt;"> </td></tr> <tr class="GFJY4-DFU-com-rdg-thunderdome-client-resources-CssResource-html-lineItem-v2v-addition" style="background-color: rgb(204, 238, 255); vertical-align: bottom"><td style="font-family: Arial, Helvetica, sans-serif; font-size: 9pt; width: 44%;"> <p style="font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-top: 0pt; margin-bottom: 0pt;">Other distributors</p> </td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; padding-bottom: 1px;"> </td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0);"> </td><td style="width: 15%; text-align: right; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">23</td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> </td><td style="width: 2%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; padding-bottom: 1px;"> </td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0);"> </td><td style="width: 15%; text-align: right; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">27</td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> </td><td style="width: 2%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; padding-bottom: 1px;"> </td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; border-bottom: 1px solid rgb(0, 0, 0);"> </td><td style="width: 15%; text-align: right; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);">29</td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> </td></tr> <tr style="background-color: rgb(255, 255, 255); vertical-align: bottom"><td style="font-family: Arial, Helvetica, sans-serif; font-size: 9pt; width: 44%;"> <p style="font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-top: 0pt; margin-bottom: 0pt; margin-left: 18pt;">Revenue attributable to distributors</p> </td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; padding-bottom: 3px;"> </td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; border-bottom: 3px double rgb(0, 0, 0);"> </td><td style="width: 15%; text-align: right; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">83</td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">%</td><td style="width: 2%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; padding-bottom: 3px;"> </td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; border-bottom: 3px double rgb(0, 0, 0);"> </td><td style="width: 15%; text-align: right; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">82</td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">%</td><td style="width: 2%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; padding-bottom: 3px;"> </td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; border-bottom: 3px double rgb(0, 0, 0);"> </td><td style="width: 15%; text-align: right; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">83</td><td style="width: 1%; font-family: Arial, Helvetica, sans-serif; font-size: 9pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">%</td></tr> </tbody></table> <p style="margin: 0; font-family: Arial, Helvetica, sans-serif; font-size: 10pt"> </p> <p style="font-family: Arial; font-size: 9pt; margin: 0pt; text-align: left;">At <em style="font: inherit;"> January 2, 2021</em> and <em style="font: inherit;"> December 28, 2019</em>, Weikeng accounted for 47% and 38%, respectively, and Arrow accounted for 45% and 40%, respectively, of net accounts receivable.</p> <p style="font-family: Arial; font-size: 9pt; margin: 0pt; text-align: left;"> </p> <p style="font-family: Arial; font-size: 9pt; margin: 0pt; text-align: left;">Concentration of credit risk with respect to accounts receivable is mitigated by our credit and collection process including active management of collections, credit limits, routine credit evaluations for essentially all customers, and secure transactions with letters of credit or advance payments where appropriate. We regularly review our allowance for doubtful accounts and the aging of our accounts receivable.</p> <p style="font-family: Arial; font-size: 9pt; margin: 0pt; text-align: left;"> </p> <p style="font-family: Arial; font-size: 9pt; margin: 0pt; text-align: left;">We rely on a limited number of foundries for our wafer purchases. We seek to mitigate the concentration of supply risk by establishing, maintaining and managing multiple foundry relationships; however, certain of our products are sourced from a single foundry and changing from <em style="font: inherit;">one</em> foundry to another can have a significant cost, or create delays in production or shipments, among other factors.</p>
CY2018	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2021	lscc	Sharebased Compensation Arrangement By Sharebased Payment Award Award Vesting Rights Number Of Consecutive Trailing Periods SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsNumberOfConsecutiveTrailingPeriods	2	pure
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	398799000	USD
CY2018	lscc	Percentage Of Revenue PercentageOfRevenue	1	pure
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	408120000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	47392000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	43493000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-26322000	USD
CY2021	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	135220000
CY2019	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	132471000
CY2018	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	126564000
CY2021	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	6056000
CY2019	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	4803000
CY2018	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	141276000
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	137274000
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	126564000
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.35
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.33
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.21
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.34
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.32
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.21
CY2021	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	316000
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	890000
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	7567000
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	408120000	USD
CY2021	lscc	Percentage Of Revenue PercentageOfRevenue	1	pure
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	404093000	USD
CY2019	lscc	Percentage Of Revenue PercentageOfRevenue	1	pure
CY2021	lscc	Percentage Of Revenue PercentageOfRevenue	1	pure
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	404093000	USD
CY2019	lscc	Percentage Of Revenue PercentageOfRevenue	1	pure
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	398799000	USD
CY2018	lscc	Percentage Of Revenue PercentageOfRevenue	1	pure
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	408120000	USD
CY2021	lscc	Percentage Of Revenue PercentageOfRevenue	1	pure
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	404093000	USD
CY2019	lscc	Percentage Of Revenue PercentageOfRevenue	1	pure
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	398799000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	64917000	USD
CY2021Q1	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	34724000	USD
CY2019Q4	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	39855000	USD
CY2018	lscc	Percentage Of Revenue PercentageOfRevenue	1	pure
CY2018Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	9143000	USD
CY2019	lscc	Contract With Customer Asset Revenue Recorded During Period ContractWithCustomerAssetRevenueRecordedDuringPeriod	17356000	USD
CY2019	us-gaap	Contract With Customer Asset Reclassified To Receivable ContractWithCustomerAssetReclassifiedToReceivable	20930000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	5569000	USD
CY2021	lscc	Contract With Customer Asset Revenue Recorded During Period ContractWithCustomerAssetRevenueRecordedDuringPeriod	15860000	USD
CY2021	us-gaap	Contract With Customer Asset Reclassified To Receivable ContractWithCustomerAssetReclassifiedToReceivable	-15818000	USD
CY2021Q1	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	5611000	USD
CY2018Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	1614000	USD
CY2019	lscc	Contract With Customer Liability Accrued For Estimated Future Stock Rotation And Scrap Returns ContractWithCustomerLiabilityAccruedForEstimatedFutureStockRotationAndScrapReturns	5763000	USD
CY2019	lscc	Contract With Customer Liability Release Of Accruals For Recognized Stock Rotation And Scrap Returns ContractWithCustomerLiabilityReleaseOfAccrualsForRecognizedStockRotationAndScrapReturns	5064000	USD
CY2019Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	2313000	USD
CY2021	lscc	Contract With Customer Liability Accrued For Estimated Future Stock Rotation And Scrap Returns ContractWithCustomerLiabilityAccruedForEstimatedFutureStockRotationAndScrapReturns	5976000	USD
CY2021	lscc	Contract With Customer Liability Release Of Accruals For Recognized Stock Rotation And Scrap Returns ContractWithCustomerLiabilityReleaseOfAccrualsForRecognizedStockRotationAndScrapReturns	5221000	USD
CY2021Q1	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	3068000	USD
CY2021	lscc	Revenue From Contract With Customer Processing Of Return Merchandise Authorizations RevenueFromContractWithCustomerProcessingOfReturnMerchandiseAuthorizations	6100000	USD
CY2019	lscc	Revenue From Contract With Customer Processing Of Return Merchandise Authorizations RevenueFromContractWithCustomerProcessingOfReturnMerchandiseAuthorizations	5000000.0	USD
CY2021	lscc	Revenue From Contract With Customer Net Impact From Release Of Accruals Offsetting By Return Merchandise Authorization RevenueFromContractWithCustomerNetImpactFromReleaseOfAccrualsOffsettingByReturnMerchandiseAuthorization	900000	USD
CY2019	lscc	Revenue From Contract With Customer Net Impact From Release Of Accruals Offsetting By Return Merchandise Authorization RevenueFromContractWithCustomerNetImpactFromReleaseOfAccrualsOffsettingByReturnMerchandiseAuthorization	100000	USD
CY2021Q1	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	64635000	USD
CY2019Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	65023000	USD
CY2021Q1	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	54000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	106000	USD
CY2021Q1	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	64581000	USD
CY2021Q1	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	29875000	USD
CY2019Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	15125000	USD
CY2021Q1	us-gaap	Inventory Net InventoryNet	64599000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	54980000	USD
CY2021Q1	lscc	Liability For Noncancelable Contracts Current LiabilityForNoncancelableContractsCurrent	8492000	USD
CY2019Q4	lscc	Liability For Noncancelable Contracts Current LiabilityForNoncancelableContractsCurrent	6964000	USD
CY2021Q1	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	8770000	USD
CY2019Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	8941000	USD
CY2021Q1	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	21411000	USD
CY2019Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	20591000	USD
CY2019Q4	us-gaap	Capitalized Computer Software Net CapitalizedComputerSoftwareNet	2543000	USD
CY2021	us-gaap	Capitalized Computer Software Additions CapitalizedComputerSoftwareAdditions	983000	USD
CY2021	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	695000	USD
CY2021Q1	us-gaap	Capitalized Computer Software Net CapitalizedComputerSoftwareNet	2831000	USD
CY2021Q1	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	150848000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	165220000	USD
CY2021Q1	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	111182000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	125990000	USD
CY2021Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	39666000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	39230000	USD
CY2021	us-gaap	Depreciation Depreciation	11800000	USD
CY2019	us-gaap	Depreciation Depreciation	11600000	USD
CY2018	us-gaap	Depreciation Depreciation	13400000	USD
CY2021Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	39666000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	39230000	USD
CY2021Q1	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	171875000	USD
CY2019Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	148125000	USD
CY2021Q1	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	1179000	USD
CY2019Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	1579000	USD
CY2021Q1	us-gaap	Long Term Debt Current LongTermDebtCurrent	12762000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	21474000	USD
CY2021Q1	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	157934000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	125072000	USD
CY2021	us-gaap	Interest Expense Debt Excluding Amortization InterestExpenseDebtExcludingAmortization	3319000	USD
CY2019	us-gaap	Interest Expense Debt Excluding Amortization InterestExpenseDebtExcludingAmortization	10278000	USD
CY2018	us-gaap	Interest Expense Debt Excluding Amortization InterestExpenseDebtExcludingAmortization	18600000	USD
CY2021	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	400000	USD
CY2019	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	1659000	USD
CY2018	us-gaap	Interest Expense Debt InterestExpenseDebt	20830000	USD
CY2018	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	2230000	USD
CY2021	us-gaap	Interest Expense Debt InterestExpenseDebt	3719000	USD
CY2019	us-gaap	Interest Expense Debt InterestExpenseDebt	11937000	USD
CY2021Q1	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	13125000	USD
CY2021Q1	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	17500000	USD
CY2021Q1	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	17500000	USD
CY2021Q1	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	123750000	USD
CY2021Q1	us-gaap	Long Term Debt LongTermDebt	171875000	USD
CY2017Q4	us-gaap	Restructuring Reserve RestructuringReserve	2447000	USD
CY2018	us-gaap	Restructuring Charges RestructuringCharges	17349000	USD
CY2018	us-gaap	Payments For Restructuring PaymentsForRestructuring	9116000	USD
CY2018Q4	us-gaap	Restructuring Reserve RestructuringReserve	10680000	USD
CY2019	us-gaap	Restructuring Charges RestructuringCharges	4664000	USD
CY2019	us-gaap	Payments For Restructuring PaymentsForRestructuring	7734000	USD
CY2019Q4	us-gaap	Restructuring Reserve RestructuringReserve	7610000	USD
CY2021	us-gaap	Restructuring Charges RestructuringCharges	3937000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	5057000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	4861000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	3552000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	3229000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	27692000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	4637000	USD
CY2021Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	23055000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	138297000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	131976000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	6321000	USD
CY2021	us-gaap	Payments For Restructuring PaymentsForRestructuring	2404000	USD
CY2021Q1	us-gaap	Restructuring Reserve RestructuringReserve	9143000	USD
CY2021Q1	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P4Y7M6D
CY2021Q1	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.065	pure
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	7600000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	7700000	USD
CY2018	us-gaap	Operating Lease Cost OperatingLeaseCost	8300000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	23591000	USD
CY2021	lscc	Rightofuse Assets Obtained For New And Modified Lease Contracts During The Period RightofuseAssetsObtainedForNewAndModifiedLeaseContractsDuringThePeriod	4297000	USD
CY2021	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	5960000	USD
CY2021	lscc	Operating Lease Rightofuse Asset Adjustments For Present Value And Foreign Currency Effects OperatingLeaseRightofuseAssetAdjustmentsForPresentValueAndForeignCurrencyEffects	250000	USD
CY2021Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	22178000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	26124000	USD
CY2021	lscc	Operating Lease Liability Additions OperatingLeaseLiabilityAdditions	2646000	USD
CY2021	us-gaap	Operating Lease Expense OperatingLeaseExpense	1629000	USD
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	7713000	USD
CY2021	lscc	Operating Lease Liabilities Adjustments For Present Value Foreign Currency And Restructuring Liability Effects OperatingLeaseLiabilitiesAdjustmentsForPresentValueForeignCurrencyAndRestructuringLiabilityEffects	369000	USD
CY2021Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	23055000	USD
CY2021Q1	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	18906000	USD
CY2021Q1	lscc	Operating Lease Liability For Previously Restructured Facilities OperatingLeaseLiabilityForPreviouslyRestructuredFacilities	8200000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	5615000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	5378000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	134380000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	127403000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	6977000	USD
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P6Y
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4573000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	13613000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	17967000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	2877000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	876000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	600000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	501000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	501000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	966000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	6321000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	11900000	USD
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	40372000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	18899000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	13646000	USD
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum	0.3987	pure
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum	0.0229	pure
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P4Y29D
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate	0.316	pure
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0251	pure
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	3332000
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	6.16
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0
CY2021	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0
CY2021	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	1057000
CY2021	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	5.70
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	11772000	USD
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	75000
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	5.69
CY2021Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	2200000
CY2021Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	6.39
CY2021Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber	2200000
CY2021Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice	6.39
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1	P3Y10M9D
CY2021Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Aggregate Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue	86739000	USD
CY2021Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber	1589000
CY2021Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice	6.40
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1	P3Y7M28D
CY2021Q1	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Aggregate Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue	62661000	USD
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	21500000	USD
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	17800000	USD
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	6500000	USD
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	2.73
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	6.62
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	1.69
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	1.50
CY2020Q1	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	40000000.0	USD
	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	400000
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	15000000.0	USD
	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	38.98
CY2021Q1	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	12000000	USD
CY2020Q1	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	0
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	0	pure
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	33417000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-8274000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	36684000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	11648000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-15695000	USD
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0.13	pure
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0.05	pure
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-317000	USD
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-90000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0.02	pure
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	48456000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	45065000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-23969000	USD
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	54000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	499000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	536000	USD
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	68000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	45000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	38000	USD
CY2021	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1025000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1345000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1869000	USD
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	1147000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	1889000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	2443000	USD
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	0	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	0	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	0	USD
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	0	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	0	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	0	USD
CY2021	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-83000	USD
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-83000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-317000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-90000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1064000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1572000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2353000	USD
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	0.02	pure
CY2021	lscc	Effective Income Tax Rate Reconciliation Federal Statutory Income Tax Rate Percent EffectiveIncomeTaxRateReconciliationFederalStatutoryIncomeTaxRatePercent	0.21	pure
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.08	pure
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.20	pure
CY2021	lscc	Effective Income Tax Rate Reconciliation Foreign Dividends Percent EffectiveIncomeTaxRateReconciliationForeignDividendsPercent	0.15	pure
CY2019	lscc	Effective Income Tax Rate Reconciliation Foreign Dividends Percent EffectiveIncomeTaxRateReconciliationForeignDividendsPercent	0	pure
CY2018	lscc	Effective Income Tax Rate Reconciliation Foreign Dividends Percent EffectiveIncomeTaxRateReconciliationForeignDividendsPercent	0	pure
CY2021	lscc	Effective Income Tax Rate Reconciliation Foreign Withholding Taxes Percent EffectiveIncomeTaxRateReconciliationForeignWithholdingTaxesPercent	0.03	pure
CY2019	lscc	Effective Income Tax Rate Reconciliation Foreign Withholding Taxes Percent EffectiveIncomeTaxRateReconciliationForeignWithholdingTaxesPercent	0.03	pure
CY2018	lscc	Effective Income Tax Rate Reconciliation Foreign Withholding Taxes Percent EffectiveIncomeTaxRateReconciliationForeignWithholdingTaxesPercent	0.05	pure
CY2019Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	198499000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	198499000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	7389000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	7291000	USD
CY2021Q1	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	2809000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	2620000	USD
CY2021Q1	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	1746000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	0	USD
CY2021Q1	us-gaap	Deferred Tax Liabilities Tax Deferred Income DeferredTaxLiabilitiesTaxDeferredIncome	64000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	0.02	pure
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0	pure
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.01	pure
CY2021	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.02	pure
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.04	pure
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.10	pure
CY2021Q1	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	5464000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	3527000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	3851000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	2812000	USD
CY2021Q1	lscc	Deferred Tax Assets Lease Liability DeferredTaxAssetsLeaseLiability	4190000	USD
CY2018Q4	lscc	Deferred Tax Assets Lease Liability DeferredTaxAssetsLeaseLiability	4369000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	10082000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	12294000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	351000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	256000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	87443000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	86899000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	83534000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	90339000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Capital Loss Carryforwards DeferredTaxAssetsCapitalLossCarryforwards	4018000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Capital Loss Carryforwards DeferredTaxAssetsCapitalLossCarryforwards	4235000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	934000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	1059000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	199867000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	205790000	USD
CY2021Q1	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	192478000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Tax Deferred Income DeferredTaxLiabilitiesTaxDeferredIncome	434000	USD
CY2021Q1	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	3939000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	3759000	USD
CY2021Q1	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	8558000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	6813000	USD
CY2021Q1	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1169000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	478000	USD
CY2019Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	198499000	USD
CY2021	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	-6021000	USD
CY2021	us-gaap	Valuation Allowances And Reserves Charged To Other Accounts ValuationAllowancesAndReservesChargedToOtherAccounts	0	USD
CY2021Q1	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	192478000	USD
CY2017Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	209691000	USD
CY2018Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	207108000	USD
CY2019	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	-8609000	USD
CY2019	us-gaap	Valuation Allowances And Reserves Charged To Other Accounts ValuationAllowancesAndReservesChargedToOtherAccounts	0	USD
CY2018	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	-2583000	USD
CY2018	us-gaap	Valuation Allowances And Reserves Charged To Other Accounts ValuationAllowancesAndReservesChargedToOtherAccounts	0	USD
CY2018Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	207108000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	56962000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	548000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	628000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	-0	USD
CY2021	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	2401000	USD
CY2021Q1	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	55737000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	44832000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	58377000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	19000	USD
CY2021Q1	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	3100000	USD
CY2021Q1	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	55700000	USD
CY2021Q1	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	53600000	USD
CY2021Q1	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	9100000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	58377000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	389000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	759000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	5000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1235000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	58285000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	238000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1084000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	213000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	2432000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	334000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	759000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	1084000	USD
CY2021Q1	us-gaap	Liability For Uncertain Tax Positions Current LiabilityForUncertainTaxPositionsCurrent	42500000	USD
CY2021Q1	us-gaap	Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Amount Of Unrecorded Benefit SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit	2700000	USD
CY2021Q1	lscc	Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Amount Of Associated Income Tax Penalties And Interest Accrued SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfAssociatedIncomeTaxPenaltiesAndInterestAccrued	400000	USD
CY2021Q1	us-gaap	Decrease In Unrecognized Tax Benefits Is Reasonably Possible DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible	3100000	USD
CY2021	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	2400000	USD
CY2019	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	800000	USD
CY2019Q1	us-gaap	Gross Profit GrossProfit	57652000	USD
	us-gaap	Restructuring And Related Cost Incurred Cost RestructuringAndRelatedCostIncurredCost	-241000	USD
CY2020Q3	us-gaap	Restructuring And Related Cost Incurred Cost RestructuringAndRelatedCostIncurredCost	2692000	USD
CY2020Q2	us-gaap	Restructuring And Related Cost Incurred Cost RestructuringAndRelatedCostIncurredCost	546000	USD
CY2020Q1	us-gaap	Restructuring And Related Cost Incurred Cost RestructuringAndRelatedCostIncurredCost	940000	USD
CY2019Q4	us-gaap	Restructuring And Related Cost Incurred Cost RestructuringAndRelatedCostIncurredCost	-55000	USD
CY2018	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	600000	USD
CY2021	lscc	Labor And Related Expense Incentive Compensation LaborAndRelatedExpenseIncentiveCompensation	7900000	USD
CY2019	lscc	Labor And Related Expense Incentive Compensation LaborAndRelatedExpenseIncentiveCompensation	5800000	USD
CY2018	lscc	Labor And Related Expense Incentive Compensation LaborAndRelatedExpenseIncentiveCompensation	5900000	USD
CY2021	us-gaap	Loss Contingency Disclosures LossContingencyDisclosures	<p style="font-family: Arial; font-size: 11pt; margin: 0pt; text-align: left;"><b><a href="#" id="Contingencies" title="Contingencies"/>Note <em style="font: inherit;">14</em> - Contingencies</b></p> <p style="font-family: Arial; font-size: 10pt; margin: 0pt; text-align: left;"> </p> <p style="font-family: Arial; font-size: 10pt; margin: 0pt; text-align: left;"><b>Legal Matters</b></p> <p style="font-family: Arial; font-size: 10pt; margin: 0pt; text-align: left;"> </p> <p style="font-family: Arial; font-size: 9pt; margin: 0pt; text-align: left;">On or about <em style="font: inherit;"> December 19, 2018, </em>Steven A.W. De Jaray, Perienne De Jaray and Darrell R. Oswald (collectively, the “Plaintiffs”) commenced an action against the Company and several unnamed defendants in the Multnomah County Circuit Court of the State of Oregon, in connection with the sale of certain products by the Company to the Plaintiffs in or around <em style="font: inherit;">2008.</em> The Plaintiffs allege that we violated The Lanham Act, engaged in negligence and fraud by failing to disclose to the Plaintiffs the export-controlled status of the subject parts. The Plaintiffs seek damages of $138 million, treble damages, and other remedies. In <em style="font: inherit;"> January 2019, </em>we removed the action to the United States District Court for the District of Oregon. At this stage of the proceedings, we do <em style="font: inherit;">not</em> have an estimate of the likelihood or the amount of any potential exposure to the Company; however, we believe that these claims are without merit and intend to vigorously defend the action.</p> <p style="font-family: Arial; font-size: 9pt; margin: 0pt; text-align: left;"> </p> <p style="font-family: Arial; font-size: 9pt; margin: 0pt; text-align: left;">From time to time, we are exposed to certain asserted and unasserted potential claims. Periodically, we review the status of each significant matter and assess its potential financial exposure. If the potential loss from any claim or legal proceeding is considered probable and a range of possible losses can be estimated, we then accrue a liability for the estimated loss. Legal proceedings are subject to uncertainties, and the outcomes are difficult to predict. Because of such uncertainties, accruals are based only on the best information available at the time. As additional information becomes available, we reassess the potential liability related to pending claims and litigation and <em style="font: inherit;"> may </em>revise estimates.</p> <p style="font-family: Arial; font-size: 9pt; margin: 0pt; text-align: left;"> </p>
CY2018Q4	us-gaap	Loss Contingency Damages Sought Value LossContingencyDamagesSoughtValue	138000000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	107173000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	103042000	USD
CY2020Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	100589000	USD
CY2020Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	97316000	USD
CY2019Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	100237000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	103469000	USD
CY2019Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	102296000	USD
CY2019Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	98091000	USD
	us-gaap	Gross Profit GrossProfit	64861000	USD
CY2020Q3	us-gaap	Gross Profit GrossProfit	62306000	USD
CY2020Q2	us-gaap	Gross Profit GrossProfit	60577000	USD
CY2020Q1	us-gaap	Gross Profit GrossProfit	57562000	USD
CY2019Q4	us-gaap	Gross Profit GrossProfit	59293000	USD
CY2019Q3	us-gaap	Gross Profit GrossProfit	61439000	USD
CY2019Q2	us-gaap	Gross Profit GrossProfit	60038000	USD
CY2019Q3	us-gaap	Restructuring And Related Cost Incurred Cost RestructuringAndRelatedCostIncurredCost	252000	USD
CY2019Q2	us-gaap	Restructuring And Related Cost Incurred Cost RestructuringAndRelatedCostIncurredCost	3126000	USD
CY2019Q1	us-gaap	Restructuring And Related Cost Incurred Cost RestructuringAndRelatedCostIncurredCost	1341000	USD
	us-gaap	Net Income Loss NetIncomeLoss	15989000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	12607000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	10629000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	8167000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	13987000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	13539000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	8559000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	7408000	USD
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.12
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.09
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.08
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.06
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.10
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.10
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.06
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.06
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.11
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.09
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.08
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.06
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.10
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.10
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.06
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.05

Files In Submission

Name	View Source	Status
0001437749-21-004238-index-headers.html	Edgar Link	pending
0001437749-21-004238-index.html	Edgar Link	pending
0001437749-21-004238.txt	Edgar Link	pending
0001437749-21-004238-xbrl.zip	Edgar Link	pending
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FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
latticelogocolorpmsa51.jpg	Edgar Link	pending
lscc-20210102.xsd	Edgar Link	pending
lscc-20210102_cal.xml	Edgar Link	unprocessable
lscc-20210102_def.xml	Edgar Link	unprocessable
lscc-20210102_lab.xml	Edgar Link	unprocessable
lscc-20210102_pre.xml	Edgar Link	unprocessable
lscc20201231b_10k.htm	Edgar Link	pending
lscc20201231b_10k_htm.xml	Edgar Link	completed
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending
totalreturngraph2020.jpg	Edgar Link	pending

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$LSCC
Lattice Semiconductor Corp Stock $lscc

2021 Q1 Form 10-K Financial Statement

#000143774921004238 Filed on February 26, 2021

Income Statement

Balance Sheet

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$LSCC Lattice Semiconductor Corp Stock $lscc

2021 Q1 Form 10-K Financial Statement

#000143774921004238 Filed on February 26, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$LSCC
Lattice Semiconductor Corp Stock $lscc