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Litigation (Details) - USD ($) $ in Thousands					1 Months Ended	3 Months Ended	12 Months Ended
	Jun. 30, 2021	May 03, 2021	Apr. 05, 2021	Nov. 13, 2020	May 31, 2021	Jun. 30, 2021	Dec. 31, 2020	Mar. 31, 2021
Loss Contingencies [Line Items]
Estimated Litigation Liability							$ 13,780
Ramirez vs Amphastar Pharmaceuticals, Inc
Loss Contingencies [Line Items]
Litigation Settlement, Amount			$ 1,000
Estimated Litigation Liability								$ 1,000
Amphastar Pharmaceuticals, Inc. Vs Aventis Pharma, SA
Loss Contingencies [Line Items]
Litigation Settlement, Amount		$ 4,400			$ 17,200
Settled Litigation [Member] | Amphastar Pharmaceuticals, Inc. Vs Aventis Pharma, SA
Loss Contingencies [Line Items]
Litigation Settlement, Amount	$ 14,500			$ 12,100			$ 12,800
Costs and expenses				$ 700
Litigation settlement accrual amount increase						$ 1,700

X

- Definition

Amount of increase (decrease) in carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs.

+ References

No definition available.

+ Details

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- Definition

Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Amount awarded to other party in judgment or settlement of litigation.

+ References

No definition available.

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- Definition

Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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