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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
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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 + Details
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