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Income (Loss) per Share Attributable to Amphastar Pharmaceuticals, Inc. Stockholders (Tables) | 9 Months Ended
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Sep. 30, 2021
Income (Loss) per Share Attributable to Amphastar Pharmaceuticals, Inc. Stockholders |
Schedule of basic and diluted net income (loss) per share calculation | ​
​ ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended | ​
​ | ​ | September 30, | ​ | September 30, | ​
​ | ​ | 2021 | ​ | 2020 | ​ | 2021 | ​ | 2020 | ​
​ | ​ | (in thousands, except per share data) | ​
Basic and dilutive numerator: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Net income attributable to Amphastar Pharmaceuticals, Inc. | ​ | $ | 29,548 | ​ | $ | 3,919 | ​ | $ | 42,356 | ​ | $ | 7,676 | ​
Denominator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average shares outstanding — basic | ​ |  | 48,022 | ​ |  | 47,496 | ​ |  | 47,758 | ​ |  | 46,886 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net effect of dilutive securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Incremental shares from equity awards | ​ |  | 1,987 | ​ |  | 2,352 | ​ |  | 1,935 | ​ |  | 2,036 | ​
Weighted-average shares outstanding — diluted | ​ |  | 50,009 | ​ |  | 49,848 | ​ |  | 49,693 | ​ |  | 48,922 | ​
Net income per share attributable to Amphastar Pharmaceuticals, Inc. stockholders — basic | ​ | $ | 0.62 | ​ | $ | 0.08 | ​ | $ | 0.89 | ​ | $ | 0.16 | ​
Net income per share attributable to Amphastar Pharmaceuticals, Inc. stockholders — diluted | ​ | $ | 0.59 | ​ | $ | 0.08 | ​ | $ | 0.85 | ​ | $ | 0.16 | ​

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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