$AMPH
Amphastar Pharmaceuticals, Inc. Stock $amph

$amph Overview Financials Valuation SEC Filings Company Website

2024 Q1 Form 10-K Financial Statement

#000129718424000009 Filed on February 29, 2024

Income Statement

Concept	2024 Q1	2023 Q4	2023
Revenue	$171.8M	$178.1M	$644.4M
YoY Change	22.72%	31.91%	29.14%
Cost Of Revenue	$81.74M	$81.97M	$293.3M
YoY Change	23.5%	28.36%	17.25%
Gross Profit	$90.10M	$96.14M	$351.1M
YoY Change	22.02%	35.09%	41.09%
Gross Profit Margin	52.43%	53.98%	54.49%
Selling, General & Admin	$25.05M	$21.74M	$80.39M
YoY Change	21.63%	35.04%	20.72%
% of Gross Profit	27.8%	22.61%	22.9%
Research & Development	$17.04M	$17.85M	$73.74M
YoY Change	-13.99%	20.42%	-1.38%
% of Gross Profit	18.92%	18.56%	21.0%
Depreciation & Amortization	$9.662M	$12.83M	$25.74M
YoY Change	184.26%	96.34%	104.31%
% of Gross Profit	10.72%	13.34%	7.33%
Operating Expenses	$42.09M	$42.16M	$154.1M
YoY Change	4.17%	26.47%	9.03%
Operating Profit	$48.01M	$53.98M	$197.0M
YoY Change	43.6%	42.68%	83.25%
Interest Expense	$8.611M	-$7.153M	$27.16M
YoY Change	2063.57%	-13855.77%	1371.18%
% of Operating Profit	17.94%	-13.25%	13.79%
Other Income/Expense, Net	-$134.0K	-$5.482M	-$25.63M
YoY Change	-198.53%	-262.38%	-399.99%
Pretax Income	$47.88M	$41.35M	$171.4M
YoY Change	42.62%	0.21%	47.67%
Income Tax	$4.126M	$4.673M	$31.83M
% Of Pretax Income	8.62%	11.3%	18.58%
Net Earnings	$43.18M	$36.17M	$137.5M
YoY Change	65.86%	6.65%	50.51%
Net Earnings / Revenue	25.13%	20.31%	21.34%
Basic Earnings Per Share	$0.90		$2.85
Diluted Earnings Per Share	$0.81	$0.68	$2.60
COMMON SHARES
Basic Shares Outstanding	48.10M	47.91M	48.27M
Diluted Shares Outstanding	53.01M		53.00M

Balance Sheet

Concept	2024 Q1	2023 Q4	2023
SHORT-TERM ASSETS
Cash & Short-Term Investments	$289.6M	$256.8M	$256.8M
YoY Change	50.11%	46.11%	46.11%
Cash & Equivalents	$201.1M	$144.3M	$144.3M
Short-Term Investments	$88.41M	$112.5M	$112.5M
Other Short-Term Assets	$11.13M	$11.49M	$11.49M
YoY Change	14.02%	14.94%	14.94%
Inventory	$115.5M	$105.8M	$105.8M
Prepaid Expenses
Receivables	$138.1M	$114.9M	$114.9M
Other Receivables	$784.0K	$526.0K	$526.0K
Total Short-Term Assets	$555.1M	$489.6M	$489.6M
YoY Change	36.16%	29.41%	29.41%
LONG-TERM ASSETS
Property, Plant & Equipment	$288.5M	$282.7M	$315.6M
YoY Change	18.5%	18.67%	19.3%
Goodwill	$3.152M	$3.216M
YoY Change	-0.72%	2.88%
Intangibles
YoY Change
Long-Term Investments	$15.16M	$15.21M	$15.21M
YoY Change	762.51%	530.16%	530.16%
Other Assets	$23.37M	$25.91M	$79.16M
YoY Change	26.07%	24.23%	33.31%
Total Long-Term Assets	$1.019B	$1.023B	$1.023B
YoY Change	178.49%	181.39%	181.39%
TOTAL ASSETS
Total Short-Term Assets	$555.1M	$489.6M	$489.6M
Total Long-Term Assets	$1.019B	$1.023B	$1.023B
Total Assets	$1.574B	$1.513B	$1.513B
YoY Change	103.49%	103.9%	103.9%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$36.53M	$25.44M	$25.44M
YoY Change	66.22%	24.08%	24.08%
Accrued Expenses	$80.16M	$67.93M	$197.9M
YoY Change	19.81%	6.57%	196.54%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$428.0K	$436.0K	$436.0K
YoY Change	-80.26%	-85.69%	-85.69%
Total Short-Term Liabilities	$255.2M	$225.4M	$225.4M
YoY Change	141.56%	137.62%	137.62%
LONG-TERM LIABILITIES
Long-Term Debt	$594.0M	$603.2M	$589.6M
YoY Change	715.14%	687.0%	709.43%
Other Long-Term Liabilities	$17.98M	$22.72M	$58.51M
YoY Change	18.49%	55.98%	28.63%
Total Long-Term Liabilities	$17.98M	$625.9M	$648.1M
YoY Change	18.49%	586.23%	447.72%
TOTAL LIABILITIES
Total Short-Term Liabilities	$255.2M	$225.4M	$225.4M
Total Long-Term Liabilities	$17.98M	$625.9M	$648.1M
Total Liabilities	$902.0M	$873.5M	$873.5M
YoY Change	300.73%	309.46%	309.46%
SHAREHOLDERS EQUITY
Retained Earnings	$452.4M	$409.3M
YoY Change	51.95%	50.62%
Common Stock	$6.000K	$6.000K
YoY Change	0.0%	0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$247.4M	$247.4M
YoY Change	25.24%	30.55%
Treasury Stock Shares
Shareholders Equity	$672.4M	$639.4M	$639.4M
YoY Change
Total Liabilities & Shareholders Equity	$1.574B	$1.513B	$1.513B
YoY Change	103.49%	103.9%	103.9%

Cashflow Statement

Concept	2024 Q1	2023 Q4	2023
OPERATING ACTIVITIES
Net Income	$43.18M	$36.17M	$137.5M
YoY Change	65.86%	6.65%	50.51%
Depreciation, Depletion And Amortization	$9.662M	$12.83M	$25.74M
YoY Change	184.26%	96.34%	104.31%
Cash From Operating Activities	$55.29M	$23.86M	$183.5M
YoY Change	36.92%	56.73%	105.76%
INVESTING ACTIVITIES
Capital Expenditures	$8.793M	$9.442M	$38.17M
YoY Change	-7.22%	49.64%	58.8%
Acquisitions
YoY Change
Other Investing Activities	$24.03M	-$93.61M	-$611.0M
YoY Change	664.31%	-1639.34%	6887.88%
Cash From Investing Activities	$15.24M	-$103.0M	-$649.1M
YoY Change	-340.6%	44899.56%	1880.4%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			$58.14M
YoY Change			45.69%
Debt Paid & Issued, Net	$98.00K		$318.7M
YoY Change	-89.88%		17792.08%
Cash From Financing Activities	-13.58M	-47.08M	454.1M
YoY Change	0.23%	191.32%	-1817.51%
NET CHANGE
Cash From Operating Activities	55.29M	23.86M	183.5M
Cash From Investing Activities	15.24M	-103.0M	-649.1M
Cash From Financing Activities	-13.58M	-47.08M	454.1M
Net Change In Cash	56.85M	-126.3M	-11.80M
YoY Change	177.1%	10738.45%	-139.68%
FREE CASH FLOW
Cash From Operating Activities	$55.29M	$23.86M	$183.5M
Capital Expenditures	$8.793M	$9.442M	$38.17M
Free Cash Flow	$46.50M	$14.42M	$145.3M
YoY Change	50.45%	61.75%	123.09%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
CY2023Q4	us-gaap	Preferred Stock Value PreferredStockValue
CY2022Q4	us-gaap	Preferred Stock Value PreferredStockValue
CY2022Q4	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#LongTermDebtAndCapitalLeaseObligations
CY2023Q4	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#LongTermDebtAndCapitalLeaseObligations
CY2022Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2023Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2022Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2023Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2023	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2023	dei	Amendment Flag AmendmentFlag	false
CY2023	dei	Entity Central Index Key EntityCentralIndexKey	0001297184
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2023Q4	us-gaap	Foreign Currency Contracts Liability Fair Value Disclosure ForeignCurrencyContractsLiabilityFairValueDisclosure	0
CY2023	dei	Document Fin Stmt Error Correction Flag DocumentFinStmtErrorCorrectionFlag	false
CY2023	dei	Document Type DocumentType	10-K
CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023	dei	Document Period End Date DocumentPeriodEndDate	2023-12-31
CY2023	dei	Document Transition Report DocumentTransitionReport	false
CY2023	dei	Entity File Number EntityFileNumber	001-36509
CY2023	dei	Entity Registrant Name EntityRegistrantName	Amphastar Pharmaceuticals, Inc.
CY2023	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2023	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	33-0702205
CY2023	dei	Entity Address Address Line1 EntityAddressAddressLine1	11570 6th Street
CY2023	dei	Entity Address City Or Town EntityAddressCityOrTown	Rancho Cucamonga
CY2023	dei	Entity Address State Or Province EntityAddressStateOrProvince	CA
CY2023	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	91730
CY2023	dei	City Area Code CityAreaCode	909
CY2023	dei	Local Phone Number LocalPhoneNumber	980-9484
CY2023	dei	Security12b Title Security12bTitle	Common Stock, par value $0.0001 per share
CY2023	dei	Trading Symbol TradingSymbol	AMPH
CY2023	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2023	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2023	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2023	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2023	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2023	dei	Entity Small Business EntitySmallBusiness	false
CY2023	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2023	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2023	dei	Entity Shell Company EntityShellCompany	false
CY2023Q2	dei	Entity Public Float EntityPublicFloat	1487116593
CY2024Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	48095862
CY2023	dei	Auditor Firm AuditorFirmId	42
CY2023	dei	Auditor Name AuditorName	Ernst & Young LLP
CY2023	dei	Auditor Location AuditorLocation	Irvine, California
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	144296000
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	156098000
CY2023Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	235000
CY2022Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	235000
CY2023Q4	us-gaap	Short Term Investments ShortTermInvestments	112510000
CY2022Q4	us-gaap	Short Term Investments ShortTermInvestments	19664000
CY2023Q4	us-gaap	Restricted Investments Current RestrictedInvestmentsCurrent	2200000
CY2022Q4	us-gaap	Restricted Investments Current RestrictedInvestmentsCurrent	2200000
CY2023Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	114943000
CY2022Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	88804000
CY2023Q4	us-gaap	Inventory Net InventoryNet	105833000
CY2022Q4	us-gaap	Inventory Net InventoryNet	103584000
CY2023Q4	amph	Income Tax Refund And Deposits IncomeTaxRefundAndDeposits	526000
CY2022Q4	amph	Income Tax Refund And Deposits IncomeTaxRefundAndDeposits	171000
CY2023Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	9057000
CY2022Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	7563000
CY2023Q4	us-gaap	Assets Current AssetsCurrent	489600000
CY2022Q4	us-gaap	Assets Current AssetsCurrent	378319000
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	282746000
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	238266000
CY2023Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	564000
CY2022Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	753000
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CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	25554000
CY2023Q4	amph	Investment In Unconsolidated Affiliate InvestmentInUnconsolidatedAffiliate	527000
CY2022Q4	amph	Investment In Unconsolidated Affiliate InvestmentInUnconsolidatedAffiliate	2414000
CY2023Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	613295000
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CY2023Q4	us-gaap	Long Term Investments LongTermInvestments	14685000
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CY2022Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	20856000
CY2023Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	53252000
CY2022Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	38527000
CY2023Q4	us-gaap	Assets Assets	1512912000
CY2022Q4	us-gaap	Assets Assets	741987000
CY2023Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	93366000
CY2022Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	84242000
CY2023Q4	amph	Accrued Payments For Asset Acquisitions AccruedPaymentsForAssetAcquisitions	126090000
CY2023Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	1609000
CY2022Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	4571000
CY2023Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	436000
CY2022Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	3046000
CY2023Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	3906000
CY2022Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	3003000
CY2023Q4	us-gaap	Liabilities Current LiabilitiesCurrent	225407000
CY2022Q4	us-gaap	Liabilities Current LiabilitiesCurrent	94862000
CY2023Q4	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	6066000
CY2022Q4	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	7225000
CY2023Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	589579000
CY2022Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	72839000
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CY2022Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	23694000
CY2022Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	144000
CY2023Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	22718000
CY2022Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	14565000
CY2023Q4	us-gaap	Liabilities Liabilities	873491000
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CY2023Q4	us-gaap	Common Stock Value CommonStockValue	6000
CY2022Q4	us-gaap	Common Stock Value CommonStockValue	6000
CY2023Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	486056000
CY2022Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	455077000
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	409268000
CY2022Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	271723000
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-8478000
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-8624000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20630000
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CY2023Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	639421000
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CY2022Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	741987000
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CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	23477000
CY2023	amph	Income Loss From Continuing Operations After Income Taxes IncomeLossFromContinuingOperationsAfterIncomeTaxes	139526000
CY2022	amph	Income Loss From Continuing Operations After Income Taxes IncomeLossFromContinuingOperationsAfterIncomeTaxes	92563000
CY2021	amph	Income Loss From Continuing Operations After Income Taxes IncomeLossFromContinuingOperationsAfterIncomeTaxes	63509000
CY2023	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-1981000
CY2022	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-1177000
CY2021	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-208000
CY2023	us-gaap	Profit Loss ProfitLoss	137545000
CY2022	us-gaap	Profit Loss ProfitLoss	91386000
CY2021	us-gaap	Profit Loss ProfitLoss	63301000
CY2021	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	1185000
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CY2022	us-gaap	Net Income Loss NetIncomeLoss	91386000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	62116000
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.85
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.88
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.30
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.60
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.74
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.25
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	48265000
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	48551000
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47777000
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	53001000
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	52427000
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	49784000
CY2023	us-gaap	Net Income Loss NetIncomeLoss	137545000
CY2022	us-gaap	Net Income Loss NetIncomeLoss	91386000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	62116000
CY2021	amph	Other Comprehensive Income Loss Reclassification For Amounts Included In Net Income OtherComprehensiveIncomeLossReclassificationForAmountsIncludedInNetIncome	-362000
CY2023	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	298000
CY2022	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-2335000
CY2021	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-2943000
CY2023	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	152000
CY2022	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-476000
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-261000
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	146000
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-1859000
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-3044000
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	137691000
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	89527000
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	59072000
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	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	-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
CY2022	us-gaap	Net Income Loss NetIncomeLoss	91386000
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-1859000
CY2022	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	39909000
CY2022	us-gaap	Stock Issued During Period Value Share Based Compensation Gross StockIssuedDuringPeriodValueShareBasedCompensationGross	15658000
CY2022	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	17860000
CY2022Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	528658000
CY2023	us-gaap	Net Income Loss NetIncomeLoss	137545000
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	146000
CY2023	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	58144000
CY2023	us-gaap	Stock Issued During Period Value Share Based Compensation Gross StockIssuedDuringPeriodValueShareBasedCompensationGross	10974000
CY2023	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	20242000
CY2023Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	639421000
CY2023	us-gaap	Profit Loss ProfitLoss	137545000
CY2022	us-gaap	Profit Loss ProfitLoss	91386000
CY2021	us-gaap	Profit Loss ProfitLoss	63301000
CY2023	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-475000
CY2022	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-141000
CY2021	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-348000
CY2021	us-gaap	Deconsolidation Gain Or Loss Amount DeconsolidationGainOrLossAmount	13587000
CY2023	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	2700000
CY2023	amph	Gain Loss On Interest Rate Swaps And Foreign Currency Transactions Net GainLossOnInterestRateSwapsAndForeignCurrencyTransactionsNet	-5330000
CY2022	amph	Gain Loss On Interest Rate Swaps And Foreign Currency Transactions Net GainLossOnInterestRateSwapsAndForeignCurrencyTransactionsNet	2196000
CY2021	amph	Gain Loss On Interest Rate Swaps And Foreign Currency Transactions Net GainLossOnInterestRateSwapsAndForeignCurrencyTransactionsNet	-27000
CY2023	us-gaap	Depreciation Depreciation	25205000
CY2022	us-gaap	Depreciation Depreciation	23815000
CY2021	us-gaap	Depreciation Depreciation	22196000
CY2023	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	12830000
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	954000
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1071000
CY2023	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	3742000
CY2022	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	3506000
CY2021	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	3266000
CY2023	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	11399000
CY2022	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	466000
CY2021	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	219000
CY2023	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-1981000
CY2022	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-1177000
CY2021	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-208000
CY2023	us-gaap	Share Based Compensation ShareBasedCompensation	20242000
CY2022	us-gaap	Share Based Compensation ShareBasedCompensation	17860000
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	18687000
CY2023	amph	Increase Decrease In Reserve For Income Tax Liabilities IncreaseDecreaseInReserveForIncomeTaxLiabilities	-1159000
CY2022	amph	Increase Decrease In Reserve For Income Tax Liabilities IncreaseDecreaseInReserveForIncomeTaxLiabilities	694000
CY2021	amph	Increase Decrease In Reserve For Income Tax Liabilities IncreaseDecreaseInReserveForIncomeTaxLiabilities	1821000
CY2023	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	12578000
CY2022	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	16445000
CY2021	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-2388000
CY2023	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	26086000
CY2022	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	10132000
CY2021	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	14921000
CY2023	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	1724000
CY2022	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	11746000
CY2021	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-1258000
CY2023	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	2728000
CY2022	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	1854000
CY2021	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-2927000
CY2023	amph	Increase Decrease In Income Tax Refund Deposits And Payable IncreaseDecreaseInIncomeTaxRefundDepositsAndPayable	3319000
CY2022	amph	Increase Decrease In Income Tax Refund Deposits And Payable IncreaseDecreaseInIncomeTaxRefundDepositsAndPayable	4555000
CY2021	amph	Increase Decrease In Income Tax Refund Deposits And Payable IncreaseDecreaseInIncomeTaxRefundDepositsAndPayable	-8349000
CY2023	amph	Operating Lease Right Of Use Assets And Liabilities Net OperatingLeaseRightOfUseAssetsAndLiabilitiesNet	-3589000
CY2022	amph	Operating Lease Right Of Use Assets And Liabilities Net OperatingLeaseRightOfUseAssetsAndLiabilitiesNet	-3154000
CY2021	amph	Operating Lease Right Of Use Assets And Liabilities Net OperatingLeaseRightOfUseAssetsAndLiabilitiesNet	-3198000
CY2023	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	13237000
CY2022	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-736000
CY2021	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	3634000
CY2023	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	183503000
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	89181000
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	97994000
CY2023	amph	Payments Acquisitions Of Assets PaymentsAcquisitionsOfAssets	506406000
CY2023	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	38166000
CY2022	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	24034000
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	27456000
CY2022	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	421000
CY2023	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	144556000
CY2022	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	35761000
CY2021	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	17375000
CY2023	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	38622000
CY2022	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	27969000
CY2021	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	18771000
CY2023	amph	Payments For Deposits And Other Assets PaymentsForDepositsAndOtherAssets	-1390000
CY2022	amph	Payments For Deposits And Other Assets PaymentsForDepositsAndOtherAssets	1372000
CY2021	amph	Payments For Deposits And Other Assets PaymentsForDepositsAndOtherAssets	2612000
CY2023	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-649116000
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-32777000
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-28672000
CY2021	amph	Payments To Acquire Additional Ownership Interest PaymentsToAcquireAdditionalOwnershipInterest	53592000
CY2023	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	10974000
CY2022	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	15658000
CY2021	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	15925000
CY2023	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	58144000
CY2022	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	39909000
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	28873000
CY2021	amph	Settlement Of Equity Awards SettlementOfEquityAwards	-839000
CY2023	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	25079000
CY2022	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	407000
CY2021	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	1738000
CY2021	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	1161000
CY2023	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	845000000
CY2021	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	70000000
CY2023	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	318658000
CY2022	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1781000
CY2021	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	36740000
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	454093000
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-26439000
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-37018000
CY2023	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-282000
CY2022	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-220000
CY2021	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-223000
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-11802000
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	29745000
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	32081000
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	156333000
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
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	144531000
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	156333000
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	126588000
CY2023	amph	Deferred Payment For Acquisition DeferredPaymentForAcquisition	121699000
CY2023	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	4454000
CY2022	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	5256000
CY2021	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	9488000
CY2023	amph	Noncash Operating Lease Right Of Use Asset NoncashOperatingLeaseRightOfUseAsset	10521000
CY2022	amph	Noncash Operating Lease Right Of Use Asset NoncashOperatingLeaseRightOfUseAsset	2166000
CY2021	amph	Noncash Operating Lease Right Of Use Asset NoncashOperatingLeaseRightOfUseAsset	11041000
CY2022	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	642000
CY2021	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	107000
CY2023	us-gaap	Interest Paid Net InterestPaidNet	17573000
CY2022	us-gaap	Interest Paid Net InterestPaidNet	3023000
CY2021	us-gaap	Interest Paid Net InterestPaidNet	2109000
CY2023	us-gaap	Income Taxes Paid IncomeTaxesPaid	49001000
CY2022	us-gaap	Income Taxes Paid IncomeTaxesPaid	44442000
CY2021	us-gaap	Income Taxes Paid IncomeTaxesPaid	8096000
CY2023	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-family:'Times New Roman','Times','serif';font-size:10pt;line-height:1.37;margin:0pt 0pt 10pt 0pt;"><span style="font-style:italic;line-height:1.19;margin-bottom:0pt;visibility:hidden;"></span></p><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 the 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: fair value of acquired assets, 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 value, impairment of investments, long-lived and intangible assets and goodwill, accrual for workers’ compensation liabilities, litigation reserves, stock price volatility for share-based compensation expense, valuation allowances for deferred tax assets, and liabilities for uncertain income tax positions.<span style="font-size:12pt;"> </span></p>
CY2023	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	1100000
CY2022	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-1800000
CY2021	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-2600000
CY2022Q4	us-gaap	Foreign Currency Contracts Liability Fair Value Disclosure ForeignCurrencyContractsLiabilityFairValueDisclosure	200000
CY2022Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	200000
CY2023Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	200000
CY2022Q4	us-gaap	Certificates Of Deposit At Carrying Value CertificatesOfDepositAtCarryingValue	2200000
CY2023Q4	us-gaap	Certificates Of Deposit At Carrying Value CertificatesOfDepositAtCarryingValue	2200000
CY2023Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2800000
CY2022Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2700000
CY2022Q4	us-gaap	Goodwill Goodwill	3126000
CY2023	amph	Workers Compensation Insurance Risk Retained Individual Claims WorkersCompensationInsuranceRiskRetainedIndividualClaims	350000
CY2023	amph	Workers Compensation Insurance Risk Retained Aggregate Claims WorkersCompensationInsuranceRiskRetainedAggregateClaims	4800000
CY2023	amph	Actuarially Determined Self Insurance Expense ActuariallyDeterminedSelfInsuranceExpense	1700000
CY2022	amph	Actuarially Determined Self Insurance Expense ActuariallyDeterminedSelfInsuranceExpense	300000
CY2021	amph	Actuarially Determined Self Insurance Expense ActuariallyDeterminedSelfInsuranceExpense	500000
CY2023Q4	us-gaap	Self Insurance Reserve SelfInsuranceReserve	4300000
CY2022Q4	us-gaap	Self Insurance Reserve SelfInsuranceReserve	3700000
CY2021Q4	us-gaap	Goodwill Goodwill	3313000
CY2022Q4	amph	Revenue Recognition Wholesaler Chargebacks RevenueRecognitionWholesalerChargebacks	26606000
CY2021Q4	amph	Revenue Recognition Wholesaler Chargebacks RevenueRecognitionWholesalerChargebacks	20167000
CY2023	amph	Revenue Recognition Wholesaler Chargebacks Provision Related To Sales In Period RevenueRecognitionWholesalerChargebacksProvisionRelatedToSalesInPeriod	257219000
CY2022	amph	Revenue Recognition Wholesaler Chargebacks Provision Related To Sales In Period RevenueRecognitionWholesalerChargebacksProvisionRelatedToSalesInPeriod	208081000
CY2023	amph	Revenue Recognition Wholesaler Chargebacks Credits Issued To Third Parties RevenueRecognitionWholesalerChargebacksCreditsIssuedToThirdParties	255905000
CY2022	amph	Revenue Recognition Wholesaler Chargebacks Credits Issued To Third Parties RevenueRecognitionWholesalerChargebacksCreditsIssuedToThirdParties	201642000
CY2023Q4	amph	Revenue Recognition Wholesaler Chargebacks RevenueRecognitionWholesalerChargebacks	27920000
CY2022Q4	amph	Revenue Recognition Wholesaler Chargebacks RevenueRecognitionWholesalerChargebacks	26606000
CY2023Q4	amph	Revenue Recognition Wholesaler Chargebacks RevenueRecognitionWholesalerChargebacks	27920000
CY2022Q4	amph	Revenue Recognition Wholesaler Chargebacks RevenueRecognitionWholesalerChargebacks	26606000
CY2023	us-gaap	Valuation Allowances And Reserves Period Increase Decrease ValuationAllowancesAndReservesPeriodIncreaseDecrease	17179000
CY2022	us-gaap	Valuation Allowances And Reserves Period Increase Decrease ValuationAllowancesAndReservesPeriodIncreaseDecrease	19451000
CY2023	amph	Product Return Rate Percentage ProductReturnRatePercentage	0.011
CY2022	amph	Product Return Rate Percentage ProductReturnRatePercentage	0.014
CY2023	us-gaap	Net Income Loss NetIncomeLoss	137545000
CY2022	us-gaap	Net Income Loss NetIncomeLoss	91386000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	62116000
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	48265000
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	48551000
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47777000
CY2023	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	4736000
CY2022	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	3876000
CY2021	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	2007000
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	53001000
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	52427000
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	49784000
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.85
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.88
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.30
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.60
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.74
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.25
CY2023	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2
CY2023	us-gaap	Revenues Revenues	644395000
CY2022	us-gaap	Revenues Revenues	498987000
CY2021	us-gaap	Revenues Revenues	437768000
CY2023	us-gaap	Gross Profit GrossProfit	351121000
CY2022	us-gaap	Gross Profit GrossProfit	248860000
CY2021	us-gaap	Gross Profit GrossProfit	199739000
CY2023	us-gaap	Operating Expenses OperatingExpenses	154134000
CY2022	us-gaap	Operating Expenses OperatingExpenses	141363000
CY2021	us-gaap	Operating Expenses OperatingExpenses	129852000
CY2023	us-gaap	Operating Income Loss OperatingIncomeLoss	196987000
CY2022	us-gaap	Operating Income Loss OperatingIncomeLoss	107497000
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	69887000
CY2023	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-25628000
CY2022	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	8543000
CY2021	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	14252000
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	171359000
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	116040000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	84139000
CY2023	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	25737000
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	12597000
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	10225000
CY2023	us-gaap	Revenues Revenues	644395000
CY2022	us-gaap	Revenues Revenues	498987000
CY2021	us-gaap	Revenues Revenues	437768000
CY2023Q4	us-gaap	Noncurrent Assets NoncurrentAssets	894662000
CY2022Q4	us-gaap	Noncurrent Assets NoncurrentAssets	264573000
CY2023Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	89517000
CY2023Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	64000
CY2023Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	22000
CY2023Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	89559000
CY2022Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	23515000
CY2022Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	62000
CY2022Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	23453000
CY2023Q4	us-gaap	Finite Lived Intangible Asset Useful Life FiniteLivedIntangibleAssetUsefulLife	P23Y
CY2023Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	602826000
CY2023Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	21972000
CY2023Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	580854000
CY2023Q4	amph	Indefinite Lived Intangible Assets Including Goodwill Gross IndefiniteLivedIntangibleAssetsIncludingGoodwillGross	32441000
CY2023Q4	amph	Indefinite Lived Intangible Assets Including Goodwill Net IndefiniteLivedIntangibleAssetsIncludingGoodwillNet	32441000
CY2023Q4	amph	Intangible Assets Gross Including Goodwill IntangibleAssetsGrossIncludingGoodwill	635267000
CY2023Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	21972000
CY2023Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	613295000
CY2022Q4	us-gaap	Finite Lived Intangible Asset Useful Life FiniteLivedIntangibleAssetUsefulLife	P11Y
CY2022Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	11488000
CY2022Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	6541000
CY2022Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	4947000
CY2022Q4	amph	Indefinite Lived Intangible Assets Including Goodwill Gross IndefiniteLivedIntangibleAssetsIncludingGoodwillGross	32351000
CY2022Q4	amph	Indefinite Lived Intangible Assets Including Goodwill Net IndefiniteLivedIntangibleAssetsIncludingGoodwillNet	32351000
CY2022Q4	amph	Intangible Assets Gross Including Goodwill IntangibleAssetsGrossIncludingGoodwill	43839000
CY2022Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	6541000
CY2022Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	37298000
CY2023	us-gaap	Goodwill Translation And Purchase Accounting Adjustments GoodwillTranslationAndPurchaseAccountingAdjustments	90000
CY2022	us-gaap	Goodwill Translation And Purchase Accounting Adjustments GoodwillTranslationAndPurchaseAccountingAdjustments	-187000
CY2023Q4	us-gaap	Goodwill Goodwill	3216000
CY2022Q4	us-gaap	Goodwill Goodwill	3126000
CY2023Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	29200000
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	24718000
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	24718000
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	24718000
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	24718000
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	24718000
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	457264000
CY2023Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	580854000
CY2023Q4	amph	Indefinite Lived Intangible Assets Including Goodwill IndefiniteLivedIntangibleAssetsIncludingGoodwill	32441000
CY2023Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	613295000
CY2023Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	50082000
CY2022Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	47607000
CY2023Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	30822000
CY2022Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	37090000
CY2023Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	24929000
CY2022Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	18887000
CY2023Q4	us-gaap	Inventory Net InventoryNet	105833000
CY2022Q4	us-gaap	Inventory Net InventoryNet	103584000
CY2023	us-gaap	Inventory Write Down InventoryWriteDown	18800000
CY2022	us-gaap	Inventory Write Down InventoryWriteDown	17200000
CY2021	us-gaap	Inventory Write Down InventoryWriteDown	24600000
CY2023Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	528044000
CY2022Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	458296000
CY2023Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	245298000
CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	220030000
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	282746000
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	238266000
CY2023	us-gaap	Depreciation Depreciation	25200000
CY2022	us-gaap	Depreciation Depreciation	23800000
CY2021	us-gaap	Depreciation Depreciation	22200000
CY2023	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	2000000.0
CY2022	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	1400000
CY2021	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	1400000
CY2023Q4	amph	Accrued Customer Fees And Rebates AccruedCustomerFeesAndRebates	16702000
CY2022Q4	amph	Accrued Customer Fees And Rebates AccruedCustomerFeesAndRebates	14198000
CY2023Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	25203000
CY2022Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	22847000
CY2023Q4	amph	Product Return Accrual Current ProductReturnAccrualCurrent	12263000
CY2022Q4	amph	Product Return Accrual Current ProductReturnAccrualCurrent	14867000
CY2023Q4	amph	Accrued Loss On Firm Purchase Commitments AccruedLossOnFirmPurchaseCommitments	918000
CY2022Q4	amph	Accrued Loss On Firm Purchase Commitments AccruedLossOnFirmPurchaseCommitments	2686000
CY2023Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	12842000
CY2022Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	9143000
CY2023Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	67928000
CY2022Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	63741000
CY2023Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	25438000
CY2022Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	20501000
CY2023Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	93366000
CY2022Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	84242000
CY2023Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	616000
CY2022Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	790000
CY2023Q4	us-gaap	Contractual Obligation ContractualObligation	603790000
CY2022Q4	us-gaap	Contractual Obligation ContractualObligation	77432000
CY2023Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	436000
CY2022Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	3046000
CY2023Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	13775000
CY2022Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	1547000
CY2023Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	589579000
CY2022Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	72839000
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	234000
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	245000
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	254000
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	7441000
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	250000000
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	345000000
CY2023Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	603174000
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	181922000
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	127204000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	86236000
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-10563000
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-11164000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-2097000
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	171359000
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	116040000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	84139000
CY2023	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	42689000
CY2022	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	37626000
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	14088000
CY2023	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1912000
CY2022	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	732000
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1182000
CY2023	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1089000
CY2022	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	998000
CY2021	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1676000
CY2023	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	45690000
CY2022	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	39356000
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	16946000
CY2023	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-13134000
CY2022	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-16119000
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	2657000
CY2023	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	1537000
CY2022	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	816000
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	110000
CY2023	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-2260000
CY2022	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-576000
CY2021	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	917000
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-13857000
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-15879000
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	3684000
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	31833000
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	23477000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20630000
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	5208000
CY2023Q4	amph	Deferred Tax Assets Operating Leases DeferredTaxAssetsOperatingLeases	8360000
CY2022Q4	amph	Deferred Tax Assets Operating Leases DeferredTaxAssetsOperatingLeases	6684000
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	5970000
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	4956000
CY2023Q4	amph	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Chargebacks DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedChargebacks	5441000
CY2022Q4	amph	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Chargebacks DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedChargebacks	5125000
CY2023	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2022	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2021	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2023	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.016
CY2022	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.011
CY2021	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.012
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.001
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.003
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.020
CY2023	amph	Effective Income Tax Rate Reconciliation Foreign Income Tax Valuation Allowance Percent EffectiveIncomeTaxRateReconciliationForeignIncomeTaxValuationAllowancePercent	0.001
CY2022	amph	Effective Income Tax Rate Reconciliation Foreign Income Tax Valuation Allowance Percent EffectiveIncomeTaxRateReconciliationForeignIncomeTaxValuationAllowancePercent	0.026
CY2021	amph	Effective Income Tax Rate Reconciliation Foreign Income Tax Valuation Allowance Percent EffectiveIncomeTaxRateReconciliationForeignIncomeTaxValuationAllowancePercent	0.055
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.042
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.031
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.032
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.032
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.035
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.002
CY2023	amph	Effective Income Tax Rate Reconciliation Executive Compensation EffectiveIncomeTaxRateReconciliationExecutiveCompensation	0.024
CY2022	amph	Effective Income Tax Rate Reconciliation Executive Compensation EffectiveIncomeTaxRateReconciliationExecutiveCompensation	0.023
CY2021	amph	Effective Income Tax Rate Reconciliation Executive Compensation EffectiveIncomeTaxRateReconciliationExecutiveCompensation	0.023
CY2022	amph	Effective Income Tax Rate Reconciliation Employee Related Expenses EffectiveIncomeTaxRateReconciliationEmployeeRelatedExpenses	0.002
CY2021	amph	Effective Income Tax Rate Reconciliation Employee Related Expenses EffectiveIncomeTaxRateReconciliationEmployeeRelatedExpenses	0.001
CY2023	amph	Intercompany Transfer Of Assets Other Than Inventory IntercompanyTransferOfAssetsOtherThanInventory	0.006
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0.004
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	-0.001
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	-0.002
CY2023	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.186
CY2022	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.202
CY2021	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.245
CY2023Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Research DeferredTaxAssetsTaxCreditCarryforwardsResearch	12759000
CY2022Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Research DeferredTaxAssetsTaxCreditCarryforwardsResearch	15418000
CY2023Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	20156000
CY2022Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	20019000
CY2023Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	12381000
CY2022Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	9598000
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	5464000
CY2023Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	1000000.0
CY2022Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	800000
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Returns And Allowances DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances	4927000
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Returns And Allowances DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances	5464000
CY2023Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	2124000
CY2022Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	2124000
CY2023Q4	amph	Deferred Tax Assets Research And Development Capitalization DeferredTaxAssetsResearchAndDevelopmentCapitalization	34036000
CY2022Q4	amph	Deferred Tax Assets Research And Development Capitalization DeferredTaxAssetsResearchAndDevelopmentCapitalization	17988000
CY2023Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	111618000
CY2022Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	92584000
CY2023Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	21630000
CY2022Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	13272000
CY2023Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	4367000
CY2022Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	8564000
CY2023Q4	amph	Deferred Tax Liabilities Operating Leases DeferredTaxLiabilitiesOperatingLeases	8037000
CY2022Q4	amph	Deferred Tax Liabilities Operating Leases DeferredTaxLiabilitiesOperatingLeases	6398000
CY2023Q4	amph	Deferred Tax Liabilities Federal Impact Of State Deferred Taxes DeferredTaxLiabilitiesFederalImpactOfStateDeferredTaxes	3577000
CY2022Q4	amph	Deferred Tax Liabilities Federal Impact Of State Deferred Taxes DeferredTaxLiabilitiesFederalImpactOfStateDeferredTaxes	3800000
CY2023Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	260000
CY2022Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	2467000
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CY2022Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	19700000
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CY2022Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	38383000
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	12895000
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	11796000
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	10053000
CY2022	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	41000
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2074000
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1643000
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1754000
CY2023	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	2476000
CY2022	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	503000
CY2021	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	11000
CY2023Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	12493000
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	12895000
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	11796000
CY2023Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	11700000
CY2022Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	12200000
CY2021Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	500000
CY2023Q4	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	285000000.0
CY2023Q4	amph	Assumed Forfeiture Rates Used In Estimates AssumedForfeitureRatesUsedInEstimates	0.07
CY2022Q4	amph	Assumed Forfeiture Rates Used In Estimates AssumedForfeitureRatesUsedInEstimates	0.07
CY2021Q4	amph	Assumed Forfeiture Rates Used In Estimates AssumedForfeitureRatesUsedInEstimates	0.06
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate	0.414
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate	0.410
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate	0.421
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.041
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.023
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.012
CY2023	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P6Y2M12D
CY2022	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P6Y1M6D
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P6Y1M6D
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	7929150
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CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	5312
CY2023	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	30.82
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	543
CY2023	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice	16.25
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	7762298
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	19.70
CY2023	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P4Y6M14D
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	327155000
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	5685943
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	16.55
CY2023	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P3Y3M
CY2023Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	257560000
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber	7601023
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice	19.46
CY2023	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1	P4Y5M15D
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Aggregate Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue	322203000
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	16.76
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	14.75
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
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	29918000
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	21279000
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	7906000
CY2023	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	14172000
CY2022	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	19202000
CY2021	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	16757000
CY2023	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested In Period Fair Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1	8890000
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CY2022Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue	9.48
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	759820
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CY2023	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares	1056606
CY2023	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue	8.41
CY2023	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Options Forfeited Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares	5312
CY2023	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Options Forfeited Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue	13.94
CY2023Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares	2076355
CY2023Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue	12.68
CY2023Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions	17100000
CY2023	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P2Y6M
CY2023Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	2600000
CY2022Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	2200000
CY2023Q4	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	6800000
CY2022Q4	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	4500000
CY2023Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	7100000
CY2022Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	4600000
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber	1007052
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	356176
CY2023	amph	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodTotalFairValue	12725000
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	2368
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	440484
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber	920376
CY2023	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	20242000
CY2022	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	17860000
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	18687000
CY2023	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	0.50
CY2023	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.06
CY2023	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	2300000
CY2022	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	2200000
CY2021	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	2000000.0
CY2023Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0325
CY2022Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0375
CY2023	us-gaap	Operating Lease Cost OperatingLeaseCost	5267000
CY2022	us-gaap	Operating Lease Cost OperatingLeaseCost	4709000
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	4328000
CY2023	us-gaap	Short Term Lease Cost ShortTermLeaseCost	332000
CY2022	us-gaap	Short Term Lease Cost ShortTermLeaseCost	300000
CY2021	us-gaap	Short Term Lease Cost ShortTermLeaseCost	518000
CY2023	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	189000
CY2022	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	237000
CY2021	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	384000
CY2023	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	45000
CY2022	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	26000
CY2021	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	26000
CY2023	amph	Finance Lease Cost FinanceLeaseCost	234000
CY2022	amph	Finance Lease Cost FinanceLeaseCost	263000
CY2021	amph	Finance Lease Cost FinanceLeaseCost	410000
CY2023	us-gaap	Lease Cost LeaseCost	5833000
CY2022	us-gaap	Lease Cost LeaseCost	5272000
CY2021	us-gaap	Lease Cost LeaseCost	5256000
CY2023	us-gaap	Operating Lease Payments OperatingLeasePayments	5106000
CY2022	us-gaap	Operating Lease Payments OperatingLeasePayments	4329000
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	4446000
CY2023	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	40000
CY2022	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	18000
CY2021	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	25000
CY2023	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	154000
CY2022	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	233000
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	310000
CY2023	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	10521000
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	2166000
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	11041000
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	642000
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	110000
CY2023Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P7Y8M12D
CY2022Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y8M12D
CY2021Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P9Y6M
CY2023Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P3Y4M24D
CY2022Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P4Y3M18D
CY2021Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P2Y4M24D
CY2023Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.055
CY2022Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.044
CY2021Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.045
CY2023Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.067
CY2022Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.067
CY2021Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.052
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	5611000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	236000
CY2023Q4	amph	Lease Liability Payments Due Next Twelve Months LeaseLiabilityPaymentsDueNextTwelveMonths	5847000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	5536000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	190000
CY2023Q4	amph	Lease Liability Payments Due Year Two LeaseLiabilityPaymentsDueYearTwo	5726000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	5586000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	158000
CY2023Q4	amph	Lease Liability Payments Due Year Three LeaseLiabilityPaymentsDueYearThree	5744000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	5359000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	104000
CY2023Q4	amph	Lease Liability Payments Due Year Four LeaseLiabilityPaymentsDueYearFour	5463000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	4605000
CY2023Q4	amph	Lease Liability Payments Due Year Five LeaseLiabilityPaymentsDueYearFive	4605000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	14805000
CY2023Q4	amph	Lease Liability Payments Due After Year Five LeaseLiabilityPaymentsDueAfterYearFive	14805000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	41502000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	688000
CY2023Q4	amph	Lease Liability Payments Due LeaseLiabilityPaymentsDue	42190000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	7875000
CY2023Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	72000
CY2023Q4	amph	Lease Liability Undiscounted Excess Amount LeaseLiabilityUndiscountedExcessAmount	7947000
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	33627000
CY2023Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	616000
CY2023Q4	amph	Lease Liability LeaseLiability	34243000
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CY2023Q4	ecd	Non Rule10b51 Arr Trmntd Flag NonRule10b51ArrTrmntdFlag	false

Files In Submission

Name	View Source	Status
amph-20231231_cal.xml	Edgar Link	unprocessable
amph-20231231_lab.xml	Edgar Link	unprocessable
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0001297184-24-000009-index.html	Edgar Link	pending
0001297184-24-000009.txt	Edgar Link	pending
0001297184-24-000009-xbrl.zip	Edgar Link	pending
amph-20231231.xsd	Edgar Link	pending
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$AMPH
Amphastar Pharmaceuticals, Inc. Stock $amph

2024 Q1 Form 10-K Financial Statement

#000129718424000009 Filed on February 29, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AMPH Amphastar Pharmaceuticals, Inc. Stock $amph

2024 Q1 Form 10-K Financial Statement

#000129718424000009 Filed on February 29, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AMPH
Amphastar Pharmaceuticals, Inc. Stock $amph