$AMPH
Amphastar Pharmaceuticals, Inc. Stock $amph

$amph Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-K Financial Statement

#000129718422000007 Filed on March 11, 2022

Income Statement

Concept	2021 Q4	2021	2020 Q4
Revenue	$120.9M	$437.8M	$95.90M
YoY Change	26.06%	25.13%	14.99%
Cost Of Revenue	$64.65M	$238.0M	$59.10M
YoY Change	9.4%	15.26%	18.2%
Gross Profit	$56.23M	$199.7M	$36.80M
YoY Change	52.81%	39.35%	10.18%
Gross Profit Margin	46.52%	45.63%	38.37%
Selling, General & Admin	$14.70M	$68.92M	$15.80M
YoY Change	-6.99%	5.78%	12.86%
% of Gross Profit	26.13%	34.51%	42.93%
Research & Development	$14.72M	$60.93M	$15.40M
YoY Change	-4.44%	-9.37%	-12.0%
% of Gross Profit	26.17%	30.51%	41.85%
Depreciation & Amortization	$5.756M	$10.23M	$5.810M
YoY Change	-0.93%	13.23%	21.04%
% of Gross Profit	10.24%	5.12%	15.79%
Operating Expenses	$31.98M	$129.9M	$33.90M
YoY Change	-5.66%	-1.91%	0.89%
Operating Profit	$24.25M	$69.89M	$2.900M
YoY Change	736.28%	538.0%	-1550.0%
Interest Expense	-$11.00K	$885.0K	$0.00
YoY Change		136.63%	-100.0%
% of Operating Profit	-0.05%	1.27%	0.0%
Other Income/Expense, Net	$2.921M	$14.25M	-$9.700M
YoY Change	-130.11%	-325.61%	-908.33%
Pretax Income	$27.16M	$84.14M	-$6.700M
YoY Change	-505.4%	1714.51%	-658.33%
Income Tax	$7.194M	$20.63M	-$1.000M
% Of Pretax Income	26.49%	24.52%
Net Earnings	$19.76M	$62.12M	-$6.300M
YoY Change	-413.65%	4327.37%	530.0%
Net Earnings / Revenue	16.35%	14.19%	-6.57%
Basic Earnings Per Share		$1.30
Diluted Earnings Per Share	$394.7K	$1.25	-$126.8K
COMMON SHARES
Basic Shares Outstanding	47.85M	47.78M	47.50M
Diluted Shares Outstanding		49.78M

Balance Sheet

Concept	2021 Q4	2021	2020 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$136.7M	$136.7M	$105.6M
YoY Change	29.43%	29.43%	23.65%
Cash & Equivalents	$126.4M	$126.4M	$92.64M
Short-Term Investments	$10.32M	$10.32M	$13.00M
Other Short-Term Assets	$9.709M	$9.709M	$10.90M
YoY Change	-10.93%	-10.93%	-20.44%
Inventory	$92.81M	$92.81M	$96.83M
Prepaid Expenses
Receivables	$78.80M	$78.80M	$66.01M
Other Receivables	$126.0K	$126.0K	$400.0K
Total Short-Term Assets	$318.1M	$318.1M	$279.7M
YoY Change	13.74%	13.74%	9.58%
LONG-TERM ASSETS
Property, Plant & Equipment	$244.2M	$271.5M	$260.1M
YoY Change	-6.08%	-3.28%	11.2%
Goodwill	$3.313M		$3.940M
YoY Change	-15.91%		8.42%
Intangibles
YoY Change
Long-Term Investments	$3.985M	$3.985M
YoY Change
Other Assets	$16.67M	$39.06M	$5.250M
YoY Change	217.43%	29.35%	-52.94%
Total Long-Term Assets	$353.4M	$353.4M	$351.6M
YoY Change	0.53%	0.54%	5.98%
TOTAL ASSETS
Total Short-Term Assets	$318.1M	$318.1M	$279.7M
Total Long-Term Assets	$353.4M	$353.4M	$351.6M
Total Assets	$671.5M	$671.5M	$631.2M
YoY Change	6.38%	6.39%	7.54%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$22.21M	$22.21M	$24.36M
YoY Change	-8.8%	-8.96%	-2.81%
Accrued Expenses	$67.33M	$70.31M	$71.15M
YoY Change	-5.36%	-5.62%	36.85%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$2.202M	$2.202M	$12.30M
YoY Change	-82.1%	-82.1%	59.74%
Total Short-Term Liabilities	$103.8M	$103.8M	$112.2M
YoY Change	-7.48%	-7.48%	24.66%
LONG-TERM LIABILITIES
Long-Term Debt	$78.19M	$74.78M	$45.92M
YoY Change	70.25%	118.64%	16.56%
Other Long-Term Liabilities	$15.65M	$46.89M	$13.21M
YoY Change	18.48%	32.45%	40.06%
Total Long-Term Liabilities	$93.84M	$121.7M	$59.14M
YoY Change	58.68%	74.8%	526.89%
TOTAL LIABILITIES
Total Short-Term Liabilities	$103.8M	$103.8M	$112.2M
Total Long-Term Liabilities	$93.84M	$121.7M	$59.14M
Total Liabilities	$226.0M	$226.0M	$182.5M
YoY Change	23.83%	-1.26%	14.47%
SHAREHOLDERS EQUITY
Retained Earnings	$180.3M		$117.8M
YoY Change	53.12%		1.21%
Common Stock	$6.000K		$5.000K
YoY Change	20.0%		0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$150.5M		$121.8M
YoY Change	23.53%		24.77%
Treasury Stock Shares
Shareholders Equity	$445.5M	$445.5M	$402.3M
YoY Change
Total Liabilities & Shareholders Equity	$671.5M	$671.5M	$631.2M
YoY Change	6.38%	6.39%	7.54%

Cashflow Statement

Concept	2021 Q4	2021	2020 Q4
OPERATING ACTIVITIES
Net Income	$19.76M	$62.12M	-$6.300M
YoY Change	-413.65%	4327.37%	530.0%
Depreciation, Depletion And Amortization	$5.756M	$10.23M	$5.810M
YoY Change	-0.93%	13.23%	21.04%
Cash From Operating Activities	$40.44M	$97.99M	$16.90M
YoY Change	139.3%	71.12%	199.12%
INVESTING ACTIVITIES
Capital Expenditures	-$6.878M	$27.46M	-$9.330M
YoY Change	-26.28%	-18.9%	10.94%
Acquisitions
YoY Change
Other Investing Activities	-$5.076M	-$1.216M	-$2.850M
YoY Change	78.11%	-52.5%	-368.87%
Cash From Investing Activities	-$11.95M	-$28.67M	-$12.18M
YoY Change	-1.86%	-21.26%	65.71%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$28.87M
YoY Change		18.21%
Debt Paid & Issued, Net		$36.74M
YoY Change		337.33%
Cash From Financing Activities	-8.696M	-37.02M	-230.0K
YoY Change	3680.87%	1548.17%	-97.78%
NET CHANGE
Cash From Operating Activities	40.44M	97.99M	16.90M
Cash From Investing Activities	-11.95M	-28.67M	-12.18M
Cash From Financing Activities	-8.696M	-37.02M	-230.0K
Net Change In Cash	19.79M	32.08M	4.490M
YoY Change	340.78%	69.23%	-137.17%
FREE CASH FLOW
Cash From Operating Activities	$40.44M	$97.99M	$16.90M
Capital Expenditures	-$6.878M	$27.46M	-$9.330M
Free Cash Flow	$47.32M	$70.54M	$26.23M
YoY Change	80.4%	201.3%	86.56%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
CY2021	dei	Amendment Flag AmendmentFlag	false
CY2021	dei	Entity Central Index Key EntityCentralIndexKey	0001297184
CY2021	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
CY2021	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2021	dei	Document Type DocumentType	10-K
CY2021	dei	Document Annual Report DocumentAnnualReport	true
CY2021	dei	Document Period End Date DocumentPeriodEndDate	2021-12-31
CY2021	dei	Document Transition Report DocumentTransitionReport	false
CY2021Q4	us-gaap	Preferred Stock Value PreferredStockValue
CY2020Q4	us-gaap	Preferred Stock Value PreferredStockValue
CY2019	amph	Other Comprehensive Income Loss Reclassification For Amounts Included In Net Income OtherComprehensiveIncomeLossReclassificationForAmountsIncludedInNetIncome
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#LongTermDebtAndCapitalLeaseObligations
CY2021Q4	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#LongTermDebtAndCapitalLeaseObligations
CY2019Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2020Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2020Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2021Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2020Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2021Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2021	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
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CY2019Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2020Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2021	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2021	dei	Entity File Number EntityFileNumber	001-36509
CY2021	dei	Entity Registrant Name EntityRegistrantName	Amphastar Pharmaceuticals, Inc.
CY2021	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2021	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	33-0702205
CY2021	dei	Entity Address Address Line1 EntityAddressAddressLine1	11570 6th Street
CY2021	dei	Entity Address City Or Town EntityAddressCityOrTown	Rancho Cucamonga
CY2021	dei	Entity Address State Or Province EntityAddressStateOrProvince	CA
CY2021	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	91730
CY2021	dei	City Area Code CityAreaCode	909
CY2021	dei	Local Phone Number LocalPhoneNumber	980-9484
CY2021	dei	Security12b Title Security12bTitle	Common Stock, par value $0.0001 per share
CY2021	dei	Trading Symbol TradingSymbol	AMPH
CY2021	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2021	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2021	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
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CY2021	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	1185000
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-306000
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-2434000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	62116000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	1403000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	48939000
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.30
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.03
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.04
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.25
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.03
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.98
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47777000
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47038000
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	46982000
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	49784000
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	49124000
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	49907000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	62116000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	1403000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	48939000
CY2021	amph	Other Comprehensive Income Loss Reclassification For Amounts Included In Net Income OtherComprehensiveIncomeLossReclassificationForAmountsIncludedInNetIncome	-362000
CY2021	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-2943000
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
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-261000
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
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-3044000
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
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	59072000
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	2369000
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	48265000
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
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	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	306000
CY2021	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-1258000
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
CY2021	us-gaap	Net Income Loss NetIncomeLoss	62116000
CY2021	amph	Other Comprehensive Income Loss Attributable To Parent OtherComprehensiveIncomeLossAttributableToParent	-2682000
CY2021	amph	Acquisition Of Additional Ownership Interest AcquisitionOfAdditionalOwnershipInterest	-68717000
CY2021	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	-1185000
CY2021	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	28873000
CY2021	us-gaap	Stock Issued During Period Value Share Based Compensation Gross StockIssuedDuringPeriodValueShareBasedCompensationGross	15925000
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	17845000
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	445522000
CY2021	us-gaap	Profit Loss ProfitLoss	63301000
CY2020	us-gaap	Profit Loss ProfitLoss	1097000
CY2019	us-gaap	Profit Loss ProfitLoss	46505000
CY2021	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-348000
CY2020	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-240000
CY2019	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-1036000
CY2021	us-gaap	Deconsolidation Gain Or Loss Amount DeconsolidationGainOrLossAmount	13587000
CY2021	us-gaap	Depreciation Depreciation	22196000
CY2020	us-gaap	Depreciation Depreciation	20491000
CY2019	us-gaap	Depreciation Depreciation	17073000
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1290000
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1036000
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1037000
CY2021	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	3266000
CY2020	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	3653000
CY2019	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	3011000
CY2021	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-208000
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	18687000
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	20498000
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	17295000
CY2021	amph	Increase Decrease In Reserve For Income Tax Liabilities IncreaseDecreaseInReserveForIncomeTaxLiabilities	1821000
CY2020	amph	Increase Decrease In Reserve For Income Tax Liabilities IncreaseDecreaseInReserveForIncomeTaxLiabilities	1285000
CY2019	amph	Increase Decrease In Reserve For Income Tax Liabilities IncreaseDecreaseInReserveForIncomeTaxLiabilities	3010000
CY2021	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-2388000
CY2020	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	162000
CY2019	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-4542000
CY2021	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	14921000
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	20160000
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-6702000
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-15297000
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	41103000
CY2021	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-3572000
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
CY2021	amph	Increase Decrease In Income Tax Refund Deposits And Payable IncreaseDecreaseInIncomeTaxRefundDepositsAndPayable	-8349000
CY2020	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	1238000
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	3570000
CY2021	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	36740000
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	8401000
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
CY2021	amph	Operating Lease Right Of Use Assets And Liabilities Net OperatingLeaseRightOfUseAssetsAndLiabilitiesNet	-3198000
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
CY2021	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	3016000
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
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	97994000
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
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	27456000
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	33855000
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	41555000
CY2021	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	17375000
CY2020	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	13557000
CY2019	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	8815000
CY2021	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	18771000
CY2020	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	12411000
CY2021	amph	Payments For Deposits And Other Assets PaymentsForDepositsAndOtherAssets	2612000
CY2020	amph	Payments For Deposits And Other Assets PaymentsForDepositsAndOtherAssets	1414000
CY2019	amph	Payments For Deposits And Other Assets PaymentsForDepositsAndOtherAssets	157000
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-28672000
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
CY2019	us-gaap	Proceeds From Issuance Of Private Placement ProceedsFromIssuanceOfPrivatePlacement	18298000
CY2020	amph	Acquisition Of Additional Ownership Interest In Anp AcquisitionOfAdditionalOwnershipInterestInAnp	106000
CY2021	amph	Payments To Acquire Additional Ownership Interest PaymentsToAcquireAdditionalOwnershipInterest	53592000
CY2021	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	15925000
CY2020	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	23165000
CY2019	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	3421000
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	28873000
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	24425000
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	22291000
CY2021	amph	Settlement Of Equity Awards SettlementOfEquityAwards	-839000
CY2021	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	1738000
CY2021	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	1161000
CY2019	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	347000
CY2021	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	70000000
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	6283000
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	6434000
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-37018000
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
CY2021	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-223000
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
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	32081000
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
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
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	126588000
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
CY2021	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	9488000
CY2020	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	11136000
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	10622000
CY2021	amph	Noncash Operating Lease Right Of Use Asset NoncashOperatingLeaseRightOfUseAsset	11041000
CY2020	amph	Noncash Operating Lease Right Of Use Asset NoncashOperatingLeaseRightOfUseAsset	4819000
CY2019	amph	Noncash Operating Lease Right Of Use Asset NoncashOperatingLeaseRightOfUseAsset	7978000
CY2021	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	107000
CY2020	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	61000
CY2019	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	143000
CY2021	us-gaap	Interest Paid Net InterestPaidNet	2109000
CY2020	us-gaap	Interest Paid Net InterestPaidNet	2199000
CY2019	us-gaap	Interest Paid Net InterestPaidNet	2435000
CY2021	us-gaap	Income Taxes Paid IncomeTaxesPaid	8096000
CY2020	us-gaap	Income Taxes Paid IncomeTaxesPaid	3411000
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	5717000
CY2021	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, fair value of financial instruments, allowance for discounts, provision for chargebacks and rebates, provision for product returns, adjustment of inventory to its net realizable values, impairment of investment, long-lived and intangible assets and goodwill, accruals for 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>
CY2021	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-2600000
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
CY2020	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	900000
CY2020	amph	Product Return Rate Percentage ProductReturnRatePercentage	0.014
CY2021Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	200000
CY2020Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	1900000
CY2020Q4	us-gaap	Certificates Of Deposit At Carrying Value CertificatesOfDepositAtCarryingValue	2200000
CY2021Q4	us-gaap	Certificates Of Deposit At Carrying Value CertificatesOfDepositAtCarryingValue	2200000
CY2021Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2300000
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1300000
CY2021	amph	Workers Compensation Insurance Risk Retained Individual Claims WorkersCompensationInsuranceRiskRetainedIndividualClaims	350000
CY2021	amph	Workers Compensation Insurance Risk Retained Aggregate Claims WorkersCompensationInsuranceRiskRetainedAggregateClaims	3500000
CY2021	amph	Actuarially Determined Self Insurance Expense ActuariallyDeterminedSelfInsuranceExpense	500000
CY2020	amph	Actuarially Determined Self Insurance Expense ActuariallyDeterminedSelfInsuranceExpense	500000
CY2019	amph	Actuarially Determined Self Insurance Expense ActuariallyDeterminedSelfInsuranceExpense	400000
CY2021Q4	us-gaap	Self Insurance Reserve SelfInsuranceReserve	4100000
CY2020Q4	us-gaap	Self Insurance Reserve SelfInsuranceReserve	4500000
CY2020Q4	amph	Revenue Recognition Wholesaler Chargebacks RevenueRecognitionWholesalerChargebacks	20380000
CY2019Q4	amph	Revenue Recognition Wholesaler Chargebacks RevenueRecognitionWholesalerChargebacks	21644000
CY2021	amph	Revenue Recognition Wholesaler Chargebacks Provision Related To Sales In Period RevenueRecognitionWholesalerChargebacksProvisionRelatedToSalesInPeriod	201133000
CY2020	amph	Revenue Recognition Wholesaler Chargebacks Provision Related To Sales In Period RevenueRecognitionWholesalerChargebacksProvisionRelatedToSalesInPeriod	158152000
CY2021	amph	Revenue Recognition Wholesaler Chargebacks Credits Issued To Third Parties RevenueRecognitionWholesalerChargebacksCreditsIssuedToThirdParties	201346000
CY2020	amph	Revenue Recognition Wholesaler Chargebacks Credits Issued To Third Parties RevenueRecognitionWholesalerChargebacksCreditsIssuedToThirdParties	159416000
CY2021Q4	amph	Revenue Recognition Wholesaler Chargebacks RevenueRecognitionWholesalerChargebacks	20167000
CY2020Q4	amph	Revenue Recognition Wholesaler Chargebacks RevenueRecognitionWholesalerChargebacks	20380000
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	-39000
CY2021Q4	amph	Product Return Accrual Current ProductReturnAccrualCurrent	16000000.0
CY2020Q4	amph	Product Return Accrual Current ProductReturnAccrualCurrent	10200000
CY2021Q4	amph	Product Return Accrual Non Current ProductReturnAccrualNonCurrent	5700000
CY2020Q4	amph	Product Return Accrual Non Current ProductReturnAccrualNonCurrent	4000000.0
CY2021	amph	Product Return Rate Percentage ProductReturnRatePercentage	0.017
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	49784000
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	49124000
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	49907000
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.30
CY2019	us-gaap	Operating Expenses OperatingExpenses	131962000
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	69887000
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	10954000
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.03
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.04
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.25
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.03
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.98
CY2021	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2
CY2021	us-gaap	Revenues Revenues	437768000
CY2020	us-gaap	Revenues Revenues	349846000
CY2019	us-gaap	Revenues Revenues	322357000
CY2021	us-gaap	Gross Profit GrossProfit	199739000
CY2020	us-gaap	Gross Profit GrossProfit	143340000
CY2019	us-gaap	Gross Profit GrossProfit	131923000
CY2021	us-gaap	Operating Expenses OperatingExpenses	129852000
CY2020	us-gaap	Operating Expenses OperatingExpenses	132386000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	62116000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	1403000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	48939000
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47777000
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47038000
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	46982000
CY2021	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	2007000
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
CY2021	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	14252000
CY2020	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-6317000
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	60267000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	84139000
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
CY2021	us-gaap	Finite Lived Intangible Asset Useful Life FiniteLivedIntangibleAssetUsefulLife	P12Y
CY2021Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	12471000
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	10225000
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	9030000
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	7058000
CY2021	us-gaap	Revenues Revenues	437768000
CY2020	us-gaap	Revenues Revenues	349846000
CY2019	us-gaap	Revenues Revenues	322357000
CY2021Q4	us-gaap	Noncurrent Assets NoncurrentAssets	271491000
CY2020Q4	us-gaap	Noncurrent Assets NoncurrentAssets	280709000
CY2021Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	6992000
CY2021Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	8000
CY2021Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	6984000
CY2020Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	3857000
CY2020Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	2000
CY2020Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	3855000
CY2021Q4	amph	Intangible Assets Gross Including Goodwill IntangibleAssetsGrossIncludingGoodwill	45009000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	6139000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	6139000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	6332000
CY2021Q4	amph	Indefinite Lived Intangible Assets Including Goodwill Gross IndefiniteLivedIntangibleAssetsIncludingGoodwillGross	32538000
CY2021Q4	amph	Indefinite Lived Intangible Assets Including Goodwill Net IndefiniteLivedIntangibleAssetsIncludingGoodwillNet	32538000
CY2021Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	38870000
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
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	5137000
CY2020Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	40615000
CY2020Q4	us-gaap	Goodwill Goodwill	3940000
CY2019Q4	us-gaap	Goodwill Goodwill	3634000
CY2021	us-gaap	Disposal Group Not Discontinued Operation Loss Gain On Write Down DisposalGroupNotDiscontinuedOperationLossGainOnWriteDown	-374000
CY2021	us-gaap	Goodwill Translation And Purchase Accounting Adjustments GoodwillTranslationAndPurchaseAccountingAdjustments	-253000
CY2020	us-gaap	Goodwill Translation And Purchase Accounting Adjustments GoodwillTranslationAndPurchaseAccountingAdjustments	306000
CY2021Q4	us-gaap	Goodwill Goodwill	3313000
CY2020Q4	us-gaap	Goodwill Goodwill	3940000
CY2021Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	29200000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	1045000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	1035000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	1035000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	1035000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	584000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	1598000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	6332000
CY2021Q4	amph	Indefinite Lived Intangible Assets Including Goodwill IndefiniteLivedIntangibleAssetsIncludingGoodwill	32538000
CY2021Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	38870000
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	260055000
CY2021	us-gaap	Depreciation Depreciation	22200000
CY2020	us-gaap	Depreciation Depreciation	20500000
CY2019	us-gaap	Depreciation Depreciation	17100000
CY2021	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	1400000
CY2020	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	1800000
CY2021Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	41853000
CY2020Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	47051000
CY2021Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	33298000
CY2020Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	37257000
CY2021Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	17656000
CY2020Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	12523000
CY2021Q4	us-gaap	Inventory Net InventoryNet	92807000
CY2020Q4	us-gaap	Inventory Net InventoryNet	96831000
CY2021	us-gaap	Inventory Write Down InventoryWriteDown	24600000
CY2020	us-gaap	Inventory Write Down InventoryWriteDown	13900000
CY2019	us-gaap	Inventory Write Down InventoryWriteDown	9400000
CY2021Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	443863000
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	444202000
CY2021Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	199619000
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	184147000
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	244244000
CY2020Q4	amph	Accrued Loss On Firm Purchase Commitments AccruedLossOnFirmPurchaseCommitments	1223000
CY2020Q4	us-gaap	Litigation Reserve LitigationReserve	13780000
CY2021Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	8793000
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	12328000
CY2021Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	67331000
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	71147000
CY2021Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	22214000
CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	24357000
CY2021Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	74776000
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	2300000
CY2021Q4	amph	Accrued Customer Fees And Rebates AccruedCustomerFeesAndRebates	12121000
CY2020Q4	amph	Accrued Customer Fees And Rebates AccruedCustomerFeesAndRebates	9029000
CY2021Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	23256000
CY2020Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	24597000
CY2021Q4	amph	Product Return Accrual Current ProductReturnAccrualCurrent	16028000
CY2020Q4	amph	Product Return Accrual Current ProductReturnAccrualCurrent	10190000
CY2021Q4	amph	Accrued Loss On Firm Purchase Commitments AccruedLossOnFirmPurchaseCommitments	7133000
CY2021Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	89545000
CY2020Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	95504000
CY2021Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	398000
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	610000
CY2021Q4	us-gaap	Contractual Obligation ContractualObligation	78583000
CY2020Q4	us-gaap	Contractual Obligation ContractualObligation	46533000
CY2021Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	2202000
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	12263000
CY2021Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	1605000
CY2020Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	84000
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	1770000
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	34186000
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	1969000
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	2414000
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	3736000
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	4184000
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	58443000
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	7439000
CY2021Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	78185000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	86236000
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
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-2097000
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
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	84139000
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
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	14088000
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	1803000
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	4283000
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1182000
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	541000
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	430000
CY2021	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1676000
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	279000
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1514000
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	16946000
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	2623000
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	6227000
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	2657000
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	9825000
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	110000
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
CY2021	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	917000
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	636000
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-2828000
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	3684000
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	917000
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	7496000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20630000
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3540000
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	13723000
CY2021	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
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
CY2021	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.012
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
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.020
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
CY2021	amph	Effective Income Tax Rate Reconciliation Foreign Income Tax Valuation Allowance Percent EffectiveIncomeTaxRateReconciliationForeignIncomeTaxValuationAllowancePercent	0.055
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
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.032
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
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.002
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
CY2021	amph	Effective Income Tax Rate Reconciliation Executive Compensation EffectiveIncomeTaxRateReconciliationExecutiveCompensation	0.023
CY2020	amph	Effective Income Tax Rate Reconciliation Executive Compensation EffectiveIncomeTaxRateReconciliationExecutiveCompensation	0.481
CY2019	amph	Effective Income Tax Rate Reconciliation Executive Compensation EffectiveIncomeTaxRateReconciliationExecutiveCompensation	0.029
CY2021	amph	Effective Income Tax Rate Reconciliation Employee Related Expenses EffectiveIncomeTaxRateReconciliationEmployeeRelatedExpenses	0.001
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
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	-0.002
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
CY2021	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.245
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.763
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.228
CY2021Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Research DeferredTaxAssetsTaxCreditCarryforwardsResearch	17019000
CY2020Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Research DeferredTaxAssetsTaxCreditCarryforwardsResearch	18531000
CY2021Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	17568000
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	16187000
CY2021Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	8489000
CY2020Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	7744000
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	4892000
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	5564000
CY2021Q4	amph	Deferred Tax Assets Operating Leases DeferredTaxAssetsOperatingLeases	6555000
CY2020Q4	amph	Deferred Tax Assets Operating Leases DeferredTaxAssetsOperatingLeases	4999000
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	5188000
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	4340000
CY2021Q4	amph	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Chargebacks DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedChargebacks	3694000
CY2020Q4	amph	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Chargebacks DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedChargebacks	3927000
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Returns And Allowances DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances	5611000
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Returns And Allowances DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances	3798000
CY2021Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	2124000
CY2020Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	2124000
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	2633000
CY2021Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	71140000
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	69847000
CY2021Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	13525000
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	13735000
CY2021Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	7893000
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	7298000
CY2021Q4	amph	Deferred Tax Liabilities Operating Leases DeferredTaxLiabilitiesOperatingLeases	6368000
CY2020Q4	amph	Deferred Tax Liabilities Operating Leases DeferredTaxLiabilitiesOperatingLeases	4808000
CY2021Q4	amph	Deferred Tax Liabilities Federal Impact Of State Deferred Taxes DeferredTaxLiabilitiesFederalImpactOfStateDeferredTaxes	3966000
CY2020Q4	amph	Deferred Tax Liabilities Federal Impact Of State Deferred Taxes DeferredTaxLiabilitiesFederalImpactOfStateDeferredTaxes	3987000
CY2021Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	642000
CY2021Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	32394000
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	29828000
CY2021Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	16881000
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	15780000
CY2021Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	21865000
CY2020Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	24239000
CY2021Q4	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	30300000
CY2020Q4	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	51600000
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	10053000
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	8331000
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	6994000
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1754000
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
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	45000
CY2021	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	11000
CY2020	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	93000
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	11796000
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	10053000
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	8331000
CY2021Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	11400000
CY2020Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	9900000
CY2021Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	500000
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
CY2021Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	300000000
CY2021Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.0001
CY2021Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	20000000
CY2021Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.0001
CY2021Q4	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	160000000.0
CY2021Q4	amph	Assumed Forfeiture Rates Used In Estimates AssumedForfeitureRatesUsedInEstimates	0.06
CY2020Q4	amph	Assumed Forfeiture Rates Used In Estimates AssumedForfeitureRatesUsedInEstimates	0.05
CY2019Q4	amph	Assumed Forfeiture Rates Used In Estimates AssumedForfeitureRatesUsedInEstimates	0.05
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate	0.421
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate	0.431
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate	0.425
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.012
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
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P6Y1M6D
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
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
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	1438338
CY2021	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	18.26
CY2021	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	1302350
CY2021	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	13.95
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	190291
CY2021	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	17.07
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	70451
CY2021	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice	15.27
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	8455721
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	15.67
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P5Y2M19D
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	64431000
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	5606787
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	15.11
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P3Y9M3D
CY2021Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	45848000
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber	8265759
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice	15.64
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1	P5Y1M20D
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Aggregate Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue	63213000
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	7.62
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
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	7906000
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
CY2021	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	16757000
CY2020	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	24357000
CY2019	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	7761000
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested In Period Fair Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1	8177000
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
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
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	1438338
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	7.62
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares	1224765
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue	6.68
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Options Forfeited Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares	190291
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Options Forfeited Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue	7.05
CY2021Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares	2848934
CY2021Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue	6.95
CY2021Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions	12300000
CY2021	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P2Y6M
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber	1156518
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	600797
CY2021	amph	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodTotalFairValue	10954000
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	78755
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	493718
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber	1184842
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	4328000
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	4462000
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	3981000
CY2021	us-gaap	Short Term Lease Cost ShortTermLeaseCost	518000
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	649000
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	613000
CY2021	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	384000
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	351000
CY2020	us-gaap	Lease Cost LeaseCost	5495000
CY2019	us-gaap	Lease Cost LeaseCost	4991000
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	4446000
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	4491000
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	3531000
CY2021	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	25000
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	18687000
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	20498000
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	17295000
CY2021	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	0.50
CY2021	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.06
CY2021	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	2000000.0
CY2020	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1900000
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1500000
CY2021Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0100
CY2020Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0030
CY2021Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	2700000
CY2020Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	3000000.0
CY2019	us-gaap	Pension Expense PensionExpense	200000
CY2020	us-gaap	Pension Expense PensionExpense	200000
CY2021	us-gaap	Pension Expense PensionExpense	200000
CY2021Q4	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	3400000
CY2021Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	3500000
CY2020Q4	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	1600000
CY2020Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	1700000
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	351000
CY2021	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	26000
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	33000
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	46000
CY2021	amph	Finance Lease Cost FinanceLeaseCost	410000
CY2020	amph	Finance Lease Cost FinanceLeaseCost	384000
CY2019	amph	Finance Lease Cost FinanceLeaseCost	397000
CY2021	us-gaap	Lease Cost LeaseCost	5256000
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	33000
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	46000
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	310000
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	369000
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	354000
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	11041000
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
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	110000
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
CY2021Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P10Y
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y8M12D
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y1M6D
CY2021Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P2Y
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P2Y3M18D
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P2Y9M18D
CY2021Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.045
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
CY2021Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.052
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
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	4141000
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	246000
CY2021Q4	amph	Lease Liability Payments Due Next Twelve Months LeaseLiabilityPaymentsDueNextTwelveMonths	4387000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	3723000
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	71000
CY2021Q4	amph	Lease Liability Payments Due Year Two LeaseLiabilityPaymentsDueYearTwo	3794000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	3385000
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	61000
CY2021Q4	amph	Lease Liability Payments Due Year Three LeaseLiabilityPaymentsDueYearThree	3446000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	3245000
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	37000
CY2021Q4	amph	Lease Liability Payments Due Year Four LeaseLiabilityPaymentsDueYearFour	3282000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	3070000
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	6000
CY2021Q4	amph	Lease Liability Payments Due Year Five LeaseLiabilityPaymentsDueYearFive	3076000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	16810000
CY2021Q4	amph	Lease Liability Payments Due After Year Five LeaseLiabilityPaymentsDueAfterYearFive	16810000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	34374000
CY2021Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	421000
CY2021Q4	amph	Lease Liability Payments Due LeaseLiabilityPaymentsDue	34795000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	6689000
CY2021Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	23000
CY2021Q4	amph	Lease Liability Undiscounted Excess Amount LeaseLiabilityUndiscountedExcessAmount	6712000
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	27685000
CY2021Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	398000
CY2021Q4	amph	Lease Liability LeaseLiability	28083000

Files In Submission

Name	View Source	Status
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0001297184-22-000007-index.html	Edgar Link	pending
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amph-20211231.xsd	Edgar Link	pending
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amph-20211231x10k_htm.xml	Edgar Link	completed
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Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
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$AMPH
Amphastar Pharmaceuticals, Inc. Stock $amph

2021 Q4 Form 10-K Financial Statement

#000129718422000007 Filed on March 11, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AMPH Amphastar Pharmaceuticals, Inc. Stock $amph

2021 Q4 Form 10-K Financial Statement

#000129718422000007 Filed on March 11, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AMPH
Amphastar Pharmaceuticals, Inc. Stock $amph