$AMPH
Amphastar Pharmaceuticals, Inc. Stock $amph

$amph Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-K Financial Statement

#000129718421000008 Filed on March 15, 2021

Income Statement

Concept	2020 Q4	2019 Q4	2018 Q4
Revenue	$95.90M	$83.40M	$89.70M
YoY Change	14.99%	-7.02%	48.51%
Cost Of Revenue	$59.10M	$50.00M	$55.00M
YoY Change	18.2%	-9.09%	37.84%
Gross Profit	$36.80M	$33.40M	$34.70M
YoY Change	10.18%	-3.75%	69.27%
Gross Profit Margin	38.37%	40.05%	38.68%
Selling, General & Admin	$15.80M	$14.00M	$16.40M
YoY Change	12.86%	-14.63%	50.46%
% of Gross Profit	42.93%	41.92%	47.26%
Research & Development	$15.40M	$17.50M	$15.50M
YoY Change	-12.0%	12.9%	59.79%
% of Gross Profit	41.85%	52.4%	44.67%
Depreciation & Amortization	$5.810M	$4.800M	$4.390M
YoY Change	21.04%	9.34%	9.75%
% of Gross Profit	15.79%	14.37%	12.65%
Operating Expenses	$33.90M	$33.60M	$33.10M
YoY Change	0.89%	1.51%	49.1%
Operating Profit	$2.900M	-$200.0K	$1.600M
YoY Change	-1550.0%	-112.5%	-194.12%
Interest Expense	$0.00	$200.0K	$100.0K
YoY Change	-100.0%	100.0%
% of Operating Profit	0.0%		6.25%
Other Income/Expense, Net	-$9.700M	$1.200M	-$1.100M
YoY Change	-908.33%	-209.09%	-283.33%
Pretax Income	-$6.700M	$1.200M	$600.0K
YoY Change	-658.33%	100.0%	-154.55%
Income Tax	-$1.000M	$400.0K	-$1.100M
% Of Pretax Income		33.33%	-183.33%
Net Earnings	-$6.300M	-$1.000M	$1.900M
YoY Change	530.0%	-152.63%	137.5%
Net Earnings / Revenue	-6.57%	-1.2%	2.12%
Basic Earnings Per Share
Diluted Earnings Per Share	-$126.8K	-$21.37K	$41.04K
COMMON SHARES
Basic Shares Outstanding	47.50M	46.84M	46.27M
Diluted Shares Outstanding

Balance Sheet

Concept	2020 Q4	2019 Q4	2018 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$105.6M	$85.40M	$89.20M
YoY Change	23.65%	-4.26%	30.79%
Cash & Equivalents	$92.64M	$73.69M	$88.20M
Short-Term Investments	$13.00M	$11.70M	$2.800M
Other Short-Term Assets	$10.90M	$13.70M	$9.700M
YoY Change	-20.44%	41.24%	-30.71%
Inventory	$96.83M	$110.5M	$69.30M
Prepaid Expenses
Receivables	$66.01M	$45.38M	$52.20M
Other Receivables	$400.0K	$300.0K	$0.00
Total Short-Term Assets	$279.7M	$255.2M	$220.3M
YoY Change	9.58%	15.86%	17.31%
LONG-TERM ASSETS
Property, Plant & Equipment	$260.1M	$233.9M	$210.4M
YoY Change	11.2%	11.15%	16.57%
Goodwill	$3.940M	$3.634M	$3.951M
YoY Change	8.42%	-8.02%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$5.250M	$11.16M	$40.50M
YoY Change	-52.94%	-72.45%	7.71%
Total Long-Term Assets	$351.6M	$331.7M	$293.3M
YoY Change	5.98%	13.1%	11.39%
TOTAL ASSETS
Total Short-Term Assets	$279.7M	$255.2M	$220.3M
Total Long-Term Assets	$351.6M	$331.7M	$293.3M
Total Assets	$631.2M	$587.0M	$513.6M
YoY Change	7.54%	14.29%	13.86%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$24.36M	$25.06M	$31.30M
YoY Change	-2.81%	-19.93%	88.55%
Accrued Expenses	$71.15M	$51.99M	$56.10M
YoY Change	36.85%	-7.33%	37.16%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$12.30M	$7.700M	$18.20M
YoY Change	59.74%	-57.69%	188.89%
Total Short-Term Liabilities	$112.2M	$90.01M	$106.8M
YoY Change	24.66%	-15.72%	58.93%
LONG-TERM LIABILITIES
Long-Term Debt	$45.92M	$39.40M	$32.00M
YoY Change	16.56%	23.13%	-21.57%
Other Long-Term Liabilities	$13.21M	$9.433M	$9.400M
YoY Change	40.06%	0.35%	18.99%
Total Long-Term Liabilities	$59.14M	$9.433M	$41.40M
YoY Change	526.89%	-77.21%	-14.99%
TOTAL LIABILITIES
Total Short-Term Liabilities	$112.2M	$90.01M	$106.8M
Total Long-Term Liabilities	$59.14M	$9.433M	$41.40M
Total Liabilities	$182.5M	$159.4M	$181.1M
YoY Change	14.47%	-11.96%	54.39%
SHAREHOLDERS EQUITY
Retained Earnings	$117.8M	$116.4M
YoY Change	1.21%
Common Stock	$5.000K	$5.000K
YoY Change	0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$121.8M	$97.63M
YoY Change	24.77%
Treasury Stock Shares
Shareholders Equity	$402.3M	$381.4M	$332.4M
YoY Change
Total Liabilities & Shareholders Equity	$631.2M	$587.0M	$513.6M
YoY Change	7.54%	14.29%	13.86%

Cashflow Statement

Concept	2020 Q4	2019 Q4	2018 Q4
OPERATING ACTIVITIES
Net Income	-$6.300M	-$1.000M	$1.900M
YoY Change	530.0%	-152.63%	137.5%
Depreciation, Depletion And Amortization	$5.810M	$4.800M	$4.390M
YoY Change	21.04%	9.34%	9.75%
Cash From Operating Activities	$16.90M	$5.650M	$9.520M
YoY Change	199.12%	-40.65%	-2.56%
INVESTING ACTIVITIES
Capital Expenditures	-$9.330M	-$8.410M	-$9.580M
YoY Change	10.94%	-12.21%	-5.34%
Acquisitions
YoY Change
Other Investing Activities	-$2.850M	$1.060M	$790.0K
YoY Change	-368.87%	34.18%	-8000.0%
Cash From Investing Activities	-$12.18M	-$7.350M	-$8.790M
YoY Change	65.71%	-16.38%	-13.23%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-230.0K	-10.38M	16.92M
YoY Change	-97.78%	-161.35%	-2215.0%
NET CHANGE
Cash From Operating Activities	16.90M	5.650M	9.520M
Cash From Investing Activities	-12.18M	-7.350M	-8.790M
Cash From Financing Activities	-230.0K	-10.38M	16.92M
Net Change In Cash	4.490M	-12.08M	17.65M
YoY Change	-137.17%	-168.44%	-1621.55%
FREE CASH FLOW
Cash From Operating Activities	$16.90M	$5.650M	$9.520M
Capital Expenditures	-$9.330M	-$8.410M	-$9.580M
Free Cash Flow	$26.23M	$14.06M	$19.10M
YoY Change	86.56%	-26.39%	-3.97%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
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CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Document Type DocumentType	10-K
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CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
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CY2020	dei	Entity File Number EntityFileNumber	001-36509
CY2020	dei	Entity Registrant Name EntityRegistrantName	Amphastar Pharmaceuticals, Inc.
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	33-0702205
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CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	49907000
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	46395000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	1403000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	48939000
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-5738000
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	1121000
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-576000
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-1957000
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	155000
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	98000
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-44000
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	966000
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-674000
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-1913000
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	2369000
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	48265000
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-7651000
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	333736000
CY2018	amph	Cumulative Effect Of New Accounting Principle In Durational Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInDurationalPeriodOfAdoption	582000
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-5738000
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-1913000
CY2018	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	38036000
CY2018	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	922000
CY2018	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	25047000
CY2018	us-gaap	Stock Issued During Period Value Share Based Compensation Gross StockIssuedDuringPeriodValueShareBasedCompensationGross	8946000
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	16680000
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	364359000
CY2019	amph	Cumulative Effect Of New Accounting Principle In Durational Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInDurationalPeriodOfAdoption	-54000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	48939000
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-674000
CY2019	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	18966000
CY2019	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	2434000
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	22291000
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation Gross StockIssuedDuringPeriodValueShareBasedCompensationGross	3421000
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	17295000
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	427528000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	1403000
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	966000
CY2020	amph	Acquisition Of Additional Ownership Interest AcquisitionOfAdditionalOwnershipInterest	-106000
CY2020	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	24425000
CY2020	us-gaap	Stock Issued During Period Value Share Based Compensation Gross StockIssuedDuringPeriodValueShareBasedCompensationGross	23165000
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	20498000
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	448723000
CY2020	us-gaap	Profit Loss ProfitLoss	1097000
CY2019	us-gaap	Profit Loss ProfitLoss	46505000
CY2018	us-gaap	Profit Loss ProfitLoss	-6660000
CY2020	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-240000
CY2019	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-1036000
CY2018	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-1429000
CY2020	us-gaap	Depreciation Depreciation	20491000
CY2019	us-gaap	Depreciation Depreciation	17073000
CY2018	us-gaap	Depreciation Depreciation	14529000
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1036000
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1037000
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	33855000
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	41555000
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	46808000
CY2019	us-gaap	Proceeds From Issuance Of Private Placement ProceedsFromIssuanceOfPrivatePlacement	18298000
CY2018	us-gaap	Proceeds From Issuance Of Private Placement ProceedsFromIssuanceOfPrivatePlacement	38036000
CY2020	amph	Acquisition Of Additional Ownership Interest In Anp AcquisitionOfAdditionalOwnershipInterestInAnp	106000
CY2020	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	23165000
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1987000
CY2020	amph	Operating Lease Right Of Use Asset Amortization OperatingLeaseRightOfUseAssetAmortization	3653000
CY2019	amph	Operating Lease Right Of Use Asset Amortization OperatingLeaseRightOfUseAssetAmortization	3011000
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	20498000
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	17295000
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	16680000
CY2020	amph	Increase Decrease In Reserve For Income Tax Liabilities IncreaseDecreaseInReserveForIncomeTaxLiabilities	1285000
CY2019	amph	Increase Decrease In Reserve For Income Tax Liabilities IncreaseDecreaseInReserveForIncomeTaxLiabilities	3010000
CY2018	amph	Increase Decrease In Reserve For Income Tax Liabilities IncreaseDecreaseInReserveForIncomeTaxLiabilities	-464000
CY2020	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	162000
CY2019	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-4542000
CY2018	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	1414000
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	20160000
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-6702000
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	16295000
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-15297000
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	41103000
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	5984000
CY2020	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	2049000
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	3604000
CY2018	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-1375000
CY2020	amph	Increase Decrease In Income Tax Refund Deposits And Payable IncreaseDecreaseInIncomeTaxRefundDepositsAndPayable	972000
CY2019	amph	Increase Decrease In Income Tax Refund Deposits And Payable IncreaseDecreaseInIncomeTaxRefundDepositsAndPayable	-591000
CY2018	amph	Increase Decrease In Income Tax Refund Deposits And Payable IncreaseDecreaseInIncomeTaxRefundDepositsAndPayable	-3849000
CY2020	amph	Operating Lease Right Of Use Assets And Liabilities Net OperatingLeaseRightOfUseAssetsAndLiabilitiesNet	-3597000
CY2019	amph	Operating Lease Right Of Use Assets And Liabilities Net OperatingLeaseRightOfUseAssetsAndLiabilitiesNet	-2613000
CY2020	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	20609000
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-11720000
CY2018	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	29159000
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	57266000
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	41762000
CY2018	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	8386000
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	38191000
CY2018	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	245000
CY2018	us-gaap	Proceeds From Sale Of Intangible Assets ProceedsFromSaleOfIntangibleAssets	4400000
CY2020	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	13557000
CY2019	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	8815000
CY2018	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	308000
CY2020	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	12411000
CY2018	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	91000
CY2020	amph	Payments For Deposits And Other Assets PaymentsForDepositsAndOtherAssets	1414000
CY2019	amph	Payments For Deposits And Other Assets PaymentsForDepositsAndOtherAssets	157000
CY2018	amph	Payments For Deposits And Other Assets PaymentsForDepositsAndOtherAssets	-198000
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-36415000
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-50527000
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-42182000
CY2019	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	3421000
CY2018	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	8946000
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	24425000
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	22291000
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	25047000
CY2020	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	1238000
CY2018	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	347000
CY2019	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	347000
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	6283000
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	3570000
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	8431000
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	8401000
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	6434000
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	5705000
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-2246000
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-3783000
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	25008000
CY2020	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	352000
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-104000
CY2018	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-274000
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	18957000
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-12652000
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	20743000
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	75550000
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	88202000
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	67459000
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	94507000
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	75550000
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	88202000
CY2020	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	11136000
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	10622000
CY2020	amph	Noncash Operating Lease Right Of Use Asset NoncashOperatingLeaseRightOfUseAsset	4819000
CY2019	amph	Noncash Operating Lease Right Of Use Asset NoncashOperatingLeaseRightOfUseAsset	7978000
CY2020	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	61000
CY2019	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	143000
CY2018	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	14000
CY2020	us-gaap	Interest Paid Net InterestPaidNet	2199000
CY2019	us-gaap	Interest Paid Net InterestPaidNet	2435000
CY2018	us-gaap	Interest Paid Net InterestPaidNet	2376000
CY2020	us-gaap	Income Taxes Paid IncomeTaxesPaid	3411000
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	5717000
CY2018	us-gaap	Income Taxes Paid IncomeTaxesPaid	339000
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-family:'Times New Roman','Times','serif';font-size:10pt;line-height:1.19;margin:0pt;"><i style="font-style:italic;">Use of Estimates</i></p><p style="font-family:'Times New Roman','Times','serif';font-size:12pt;line-height:1.19;margin:0pt;"><span style="font-size:10pt;margin-bottom:14pt;visibility:hidden;"></span></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;line-height:1.19;margin:0pt;">The preparation of consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates. The principal accounting estimates include: determination of allowances for credit losses, allowance for discounts, provision for chargebacks and rebates, provision for product returns, adjustment of inventory to their net realizable values, impairment of long-lived and intangible assets and goodwill, workers’ compensation liabilities, litigation reserves, stock price volatilities for share-based compensation expense, valuation allowances for deferred tax assets, and liabilities for uncertain income tax positions.</p>
CY2020	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	3000000.0
CY2019	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-700000
CY2018	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-1500000
CY2020	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	900000
CY2019Q4	amph	Revenue Recognition Wholesaler Chargebacks RevenueRecognitionWholesalerChargebacks	21644000
CY2019Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	1900000
CY2020Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	1900000
CY2020Q4	us-gaap	Certificates Of Deposit At Carrying Value CertificatesOfDepositAtCarryingValue	2200000
CY2019Q4	us-gaap	Certificates Of Deposit At Carrying Value CertificatesOfDepositAtCarryingValue	2300000
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1300000
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1100000
CY2018Q4	amph	Revenue Recognition Wholesaler Chargebacks RevenueRecognitionWholesalerChargebacks	22423000
CY2020	amph	Workers Compensation Insurance Risk Retained Individual Claims WorkersCompensationInsuranceRiskRetainedIndividualClaims	350000
CY2020	amph	Workers Compensation Insurance Risk Retained Aggregate Claims WorkersCompensationInsuranceRiskRetainedAggregateClaims	3500000
CY2020	amph	Actuarially Determined Self Insurance Expense ActuariallyDeterminedSelfInsuranceExpense	500000
CY2019	amph	Actuarially Determined Self Insurance Expense ActuariallyDeterminedSelfInsuranceExpense	400000
CY2018	amph	Actuarially Determined Self Insurance Expense ActuariallyDeterminedSelfInsuranceExpense	2600000
CY2020Q4	us-gaap	Self Insurance Reserve SelfInsuranceReserve	4500000
CY2019Q4	us-gaap	Self Insurance Reserve SelfInsuranceReserve	4900000
CY2020	amph	Revenue Recognition Wholesaler Chargebacks Provision Related To Sales In Period RevenueRecognitionWholesalerChargebacksProvisionRelatedToSalesInPeriod	158152000
CY2019	amph	Revenue Recognition Wholesaler Chargebacks Provision Related To Sales In Period RevenueRecognitionWholesalerChargebacksProvisionRelatedToSalesInPeriod	131524000
CY2020	amph	Revenue Recognition Wholesaler Chargebacks Credits Issued To Third Parties RevenueRecognitionWholesalerChargebacksCreditsIssuedToThirdParties	159416000
CY2019	amph	Revenue Recognition Wholesaler Chargebacks Credits Issued To Third Parties RevenueRecognitionWholesalerChargebacksCreditsIssuedToThirdParties	132303000
CY2020Q4	amph	Revenue Recognition Wholesaler Chargebacks RevenueRecognitionWholesalerChargebacks	20380000
CY2019Q4	amph	Revenue Recognition Wholesaler Chargebacks RevenueRecognitionWholesalerChargebacks	21644000
CY2020Q4	amph	Product Return Accrual Current ProductReturnAccrualCurrent	10200000
CY2019Q4	amph	Product Return Accrual Current ProductReturnAccrualCurrent	7100000
CY2020Q4	amph	Product Return Accrual Non Current ProductReturnAccrualNonCurrent	4000000.0
CY2019Q4	amph	Product Return Accrual Non Current ProductReturnAccrualNonCurrent	3200000
CY2020	amph	Product Return Rate Percentage ProductReturnRatePercentage	0.014
CY2019	amph	Product Return Rate Percentage ProductReturnRatePercentage	0.011
CY2019	amph	Antidilutive Securities Excluded From Computation Of Earnings Per Share Exercise Price Of Excluded Securities AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareExercisePriceOfExcludedSecurities	21.99
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	10954000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	1403000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	48939000
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-5738000
CY2020	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	47038000
CY2019	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	46982000
CY2018	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	46395000
CY2020	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	2086000
CY2019	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	2925000
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	49124000
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	49907000
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	46395000
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.03
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.04
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.12
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.03
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.98
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.12
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2
CY2020	us-gaap	Revenues Revenues	349846000
CY2019	us-gaap	Revenues Revenues	322357000
CY2018	us-gaap	Revenues Revenues	294666000
CY2020	us-gaap	Gross Profit GrossProfit	143340000
CY2019	us-gaap	Gross Profit GrossProfit	131923000
CY2018	us-gaap	Gross Profit GrossProfit	106985000
CY2020	us-gaap	Operating Expenses OperatingExpenses	132386000
CY2019	us-gaap	Operating Expenses OperatingExpenses	131962000
CY2018	us-gaap	Operating Expenses OperatingExpenses	115608000
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	-39000
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	-8623000
CY2020	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-6317000
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	60267000
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-1303000
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	4637000
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	60228000
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-9926000
CY2020	us-gaap	Revenues Revenues	349846000
CY2019	us-gaap	Revenues Revenues	322357000
CY2018	us-gaap	Revenues Revenues	294666000
CY2020Q4	us-gaap	Noncurrent Assets NoncurrentAssets	280709000
CY2019Q4	us-gaap	Noncurrent Assets NoncurrentAssets	253548000
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	9030000
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	7058000
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	6053000
CY2019Q4	us-gaap	Goodwill Goodwill	3634000
CY2020Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	29200000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	5137000
CY2020Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	40615000
CY2019	us-gaap	Finite Lived Intangible Asset Useful Life FiniteLivedIntangibleAssetUsefulLife	P12Y
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	12321000
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	4027000
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	8294000
CY2019Q4	amph	Indefinite Lived Intangible Assets Including Goodwill Gross IndefiniteLivedIntangibleAssetsIncludingGoodwillGross	32859000
CY2019Q4	amph	Indefinite Lived Intangible Assets Including Goodwill Net IndefiniteLivedIntangibleAssetsIncludingGoodwillNet	32859000
CY2019Q4	amph	Intangible Assets Gross Including Goodwill IntangibleAssetsGrossIncludingGoodwill	45180000
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	4027000
CY2019Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	41153000
CY2020Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	1307000
CY2020Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	1307000
CY2019Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	2790000
CY2019Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	1000
CY2019Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	2789000
CY2020	us-gaap	Finite Lived Intangible Asset Useful Life FiniteLivedIntangibleAssetUsefulLife	P12Y
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	12587000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	5137000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	7450000
CY2020Q4	amph	Indefinite Lived Intangible Assets Including Goodwill Gross IndefiniteLivedIntangibleAssetsIncludingGoodwillGross	33165000
CY2020Q4	amph	Indefinite Lived Intangible Assets Including Goodwill Net IndefiniteLivedIntangibleAssetsIncludingGoodwillNet	33165000
CY2020Q4	amph	Intangible Assets Gross Including Goodwill IntangibleAssetsGrossIncludingGoodwill	45752000
CY2019Q4	us-gaap	Goodwill Goodwill	3634000
CY2018Q4	us-gaap	Goodwill Goodwill	3951000
CY2020	us-gaap	Goodwill Translation And Purchase Accounting Adjustments GoodwillTranslationAndPurchaseAccountingAdjustments	306000
CY2019	us-gaap	Goodwill Translation And Purchase Accounting Adjustments GoodwillTranslationAndPurchaseAccountingAdjustments	-317000
CY2020Q4	us-gaap	Goodwill Goodwill	3940000
CY2020Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	47051000
CY2019Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	59233000
CY2020Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	37257000
CY2019Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	35548000
CY2020Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	12523000
CY2019Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	15720000
CY2020Q4	us-gaap	Inventory Net InventoryNet	96831000
CY2019Q4	us-gaap	Inventory Net InventoryNet	110501000
CY2020	us-gaap	Inventory Write Down InventoryWriteDown	13900000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	1064000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	1045000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	1035000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	1035000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	1035000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	2236000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	7450000
CY2020Q4	amph	Indefinite Lived Intangible Assets Including Goodwill IndefiniteLivedIntangibleAssetsIncludingGoodwill	33165000
CY2020Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	40615000
CY2019	us-gaap	Inventory Write Down InventoryWriteDown	9400000
CY2018	us-gaap	Inventory Write Down InventoryWriteDown	12900000
CY2019Q4	amph	Product Return Accrual Current ProductReturnAccrualCurrent	7126000
CY2020Q4	amph	Accrued Loss On Firm Purchase Commitments AccruedLossOnFirmPurchaseCommitments	1223000
CY2019Q4	amph	Accrued Loss On Firm Purchase Commitments AccruedLossOnFirmPurchaseCommitments	3352000
CY2020Q4	us-gaap	Litigation Reserve LitigationReserve	13780000
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	444202000
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	398261000
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	184147000
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	164405000
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	260055000
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	233856000
CY2020	us-gaap	Depreciation Depreciation	20500000
CY2019	us-gaap	Depreciation Depreciation	17100000
CY2018	us-gaap	Depreciation Depreciation	14500000
CY2020	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	1800000
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	2300000
CY2018	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	2200000
CY2020Q4	amph	Accrued Customer Fees And Rebates AccruedCustomerFeesAndRebates	9029000
CY2019Q4	amph	Accrued Customer Fees And Rebates AccruedCustomerFeesAndRebates	9633000
CY2020Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	24597000
CY2019Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	21872000
CY2020Q4	amph	Product Return Accrual Current ProductReturnAccrualCurrent	10190000
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	12328000
CY2019Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	10007000
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	71147000
CY2019Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	51990000
CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	24357000
CY2019Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	25061000
CY2020Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	95504000
CY2019Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	77051000
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	526000
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	811000
CY2020Q4	us-gaap	Contractual Obligation ContractualObligation	46449000
CY2019Q4	us-gaap	Contractual Obligation ContractualObligation	47135000
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	12263000
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	7741000
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	34186000
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	39394000
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	11950000
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	7450000
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	5666000
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	3069000
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	1273000
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	16515000
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	45923000
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	15634000
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	77092000
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	3580000
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-10997000
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-16864000
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-13506000
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	4637000
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	60228000
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-9926000
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	1803000
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	4283000
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	32000
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	541000
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	430000
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	343000
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	279000
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1514000
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	773000
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	2623000
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	6227000
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	1148000
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	1770000
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	9825000
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-687000
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-1489000
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	499000
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-3900000
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	636000
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-2828000
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	173000
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	917000
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	7496000
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-4414000
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3540000
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	13723000
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-3266000
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2020	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	-0.162
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.012
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.283
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.201
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.012
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.040
CY2020	amph	Effective Income Tax Rate Reconciliation Foreign Income Tax Valuation Allowance Percent EffectiveIncomeTaxRateReconciliationForeignIncomeTaxValuationAllowancePercent	0.895
CY2019	amph	Effective Income Tax Rate Reconciliation Foreign Income Tax Valuation Allowance Percent EffectiveIncomeTaxRateReconciliationForeignIncomeTaxValuationAllowancePercent	0.025
CY2018	amph	Effective Income Tax Rate Reconciliation Foreign Income Tax Valuation Allowance Percent EffectiveIncomeTaxRateReconciliationForeignIncomeTaxValuationAllowancePercent	-0.420
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.651
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.048
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	-0.280
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.187
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.015
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.051
CY2020	amph	Effective Income Tax Rate Reconciliation Executive Compensation EffectiveIncomeTaxRateReconciliationExecutiveCompensation	0.481
CY2019	amph	Effective Income Tax Rate Reconciliation Executive Compensation EffectiveIncomeTaxRateReconciliationExecutiveCompensation	0.029
CY2018	amph	Effective Income Tax Rate Reconciliation Executive Compensation EffectiveIncomeTaxRateReconciliationExecutiveCompensation	-0.124
CY2018	amph	Effective Income Tax Rate Reconciliation Deferred Tax Remeasurement EffectiveIncomeTaxRateReconciliationDeferredTaxRemeasurement	0.010
CY2020	amph	Effective Income Tax Rate Reconciliation Employee Related Expenses EffectiveIncomeTaxRateReconciliationEmployeeRelatedExpenses	0.017
CY2019	amph	Effective Income Tax Rate Reconciliation Employee Related Expenses EffectiveIncomeTaxRateReconciliationEmployeeRelatedExpenses	0.002
CY2018	amph	Effective Income Tax Rate Reconciliation Employee Related Expenses EffectiveIncomeTaxRateReconciliationEmployeeRelatedExpenses	-0.004
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	-0.013
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0.001
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0.003
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.763
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.228
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.329
CY2020Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Research DeferredTaxAssetsTaxCreditCarryforwardsResearch	18531000
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Research DeferredTaxAssetsTaxCreditCarryforwardsResearch	18603000
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	16187000
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	10782000
CY2020Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	7744000
CY2019Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	8518000
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	5564000
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	6390000
CY2020Q4	amph	Deferred Tax Assets Operating Leases DeferredTaxAssetsOperatingLeases	4999000
CY2019Q4	amph	Deferred Tax Assets Operating Leases DeferredTaxAssetsOperatingLeases	4741000
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	4340000
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	4153000
CY2020Q4	amph	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Chargebacks DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedChargebacks	3927000
CY2019Q4	amph	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Chargebacks DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedChargebacks	3729000
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Returns And Allowances DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances	3798000
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Returns And Allowances DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances	2835000
CY2020Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	2124000
CY2019Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	2124000
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	2633000
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	85000
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	69847000
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	61960000
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	13735000
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	11528000
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	7298000
CY2019Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	6743000
CY2020Q4	amph	Deferred Tax Liabilities Operating Leases DeferredTaxLiabilitiesOperatingLeases	4808000
CY2019Q4	amph	Deferred Tax Liabilities Operating Leases DeferredTaxLiabilitiesOperatingLeases	4571000
CY2020Q4	amph	Deferred Tax Liabilities Federal Impact Of State Deferred Taxes DeferredTaxLiabilitiesFederalImpactOfStateDeferredTaxes	3987000
CY2019Q4	amph	Deferred Tax Liabilities Federal Impact Of State Deferred Taxes DeferredTaxLiabilitiesFederalImpactOfStateDeferredTaxes	3674000
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	29828000
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	26516000
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	15780000
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	10438000
CY2020Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	24239000
CY2019Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	25006000
CY2020Q4	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	51600000
CY2019Q4	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	44900000
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	8331000
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	6994000
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	7438000
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	1566000
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1815000
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1382000
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1304000
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	45000
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	126000
CY2020	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	93000
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	56000
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	10053000
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	8331000
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	6994000
CY2020Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	9900000
CY2019Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	8100000
CY2018Q4	us-gaap	Decrease In Unrecognized Tax Benefits Is Reasonably Possible DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible	1600000
CY2018	us-gaap	Income Tax Reconciliation Tax Settlements State And Local IncomeTaxReconciliationTaxSettlementsStateAndLocal	100000
CY2020Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	200000
CY2019Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	300000
CY2018Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	100000
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	300000000
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.0001
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	20000000
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CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate	0.431
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CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate	0.399
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.008
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.024
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.027
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P5Y8M12D
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P5Y8M12D
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P5Y8M12D
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CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	13.96
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	112180
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	16.42
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	1112774
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice	16.45
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	8580475
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	15.00
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P5Y2M12D
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	45392000
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	5754823
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CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P3Y11M4D
CY2020Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	33548000
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Options Forfeited Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue	7.09
CY2020Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares	2825652
CY2020Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue	6.50
CY2020Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions	11200000
CY2020	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P2Y2M12D
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	5.51
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	8.48
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	7.80
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	9169000
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	7718000
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	7372000
CY2020	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	24357000
CY2019	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	7761000
CY2018	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	11753000
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested In Period Fair Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1	9978000
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested In Period Fair Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1	7613000
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested In Period Fair Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1	7972000
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CY2019Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue	6.99
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	1803048
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CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares	1612349
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue	6.19
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Options Forfeited Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares	112180
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CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	733566
CY2020	amph	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodTotalFairValue	9926000
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	48490
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	628054
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber	1156518
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	20498000
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	17295000
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	16680000
CY2020	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	0.50
CY2020	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.06
CY2020	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1900000
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1500000
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1300000
CY2020Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0030
CY2019Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0090
CY2020	us-gaap	Pension Expense PensionExpense	200000
CY2019	us-gaap	Pension Expense PensionExpense	200000
CY2018	us-gaap	Pension Expense PensionExpense	300000
CY2020Q4	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	1600000
CY2020Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	1700000
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	4462000
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	3981000
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	649000
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	613000
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	351000
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	351000
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	33000
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	46000
CY2020	amph	Finance Lease Cost FinanceLeaseCost	384000
CY2019	amph	Finance Lease Cost FinanceLeaseCost	397000
CY2020	us-gaap	Lease Cost LeaseCost	5495000
CY2019	us-gaap	Lease Cost LeaseCost	4991000
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	4491000
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	3531000
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	33000
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	46000
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	369000
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	354000
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	4819000
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	7978000
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	61000
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	143000
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y8M12D
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y1M6D
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P2Y3M18D
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P2Y9M18D
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.052
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.059
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.050
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.046
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	4362000
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	250000
CY2020Q4	amph	Lease Liability Payments Due Next Twelve Months LeaseLiabilityPaymentsDueNextTwelveMonths	4612000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	4071000
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	210000
CY2020Q4	amph	Lease Liability Payments Due Year Two LeaseLiabilityPaymentsDueYearTwo	4281000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	2819000
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	50000
CY2020Q4	amph	Lease Liability Payments Due Year Three LeaseLiabilityPaymentsDueYearThree	2869000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	2308000
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	38000
CY2020Q4	amph	Lease Liability Payments Due Year Four LeaseLiabilityPaymentsDueYearFour	2346000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	1976000
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	18000
CY2020Q4	amph	Lease Liability Payments Due Year Five LeaseLiabilityPaymentsDueYearFive	1994000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	10691000
CY2020Q4	amph	Lease Liability Payments Due After Year Five LeaseLiabilityPaymentsDueAfterYearFive	10691000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	26227000
CY2020Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	566000
CY2020Q4	amph	Lease Liability Payments Due LeaseLiabilityPaymentsDue	26793000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	5406000
CY2020Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	40000
CY2020Q4	amph	Lease Liability Undiscounted Excess Amount LeaseLiabilityUndiscountedExcessAmount	5446000
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	20821000
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	526000
CY2020Q4	amph	Lease Liability LeaseLiability	21347000

Files In Submission

Name	View Source	Status
0001297184-21-000008-index-headers.html	Edgar Link	pending
0001297184-21-000008-index.html	Edgar Link	pending
0001297184-21-000008.txt	Edgar Link	pending
0001297184-21-000008-xbrl.zip	Edgar Link	pending
amph-20201231.xsd	Edgar Link	pending
amph-20201231ex10400a25b.htm	Edgar Link	pending
amph-20201231ex2111ae2e6.htm	Edgar Link	pending
amph-20201231ex231357d13.htm	Edgar Link	pending
amph-20201231ex311273657.htm	Edgar Link	pending
amph-20201231ex3124acfaf.htm	Edgar Link	pending
amph-20201231ex321fced5d.htm	Edgar Link	pending
amph-20201231ex322472937.htm	Edgar Link	pending
amph-20201231ex429405cd2.htm	Edgar Link	pending
amph-20201231x10k.htm	Edgar Link	pending
amph-20201231x10k001.jpg	Edgar Link	pending
amph-20201231x10k_htm.xml	Edgar Link	completed
amph-20201231_cal.xml	Edgar Link	unprocessable
amph-20201231_def.xml	Edgar Link	unprocessable
amph-20201231_lab.xml	Edgar Link	unprocessable
amph-20201231_pre.xml	Edgar Link	unprocessable
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
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$AMPH
Amphastar Pharmaceuticals, Inc. Stock $amph

2020 Q4 Form 10-K Financial Statement

#000129718421000008 Filed on March 15, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AMPH Amphastar Pharmaceuticals, Inc. Stock $amph

2020 Q4 Form 10-K Financial Statement

#000129718421000008 Filed on March 15, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AMPH
Amphastar Pharmaceuticals, Inc. Stock $amph