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Income per Share Attributable to Amphastar Pharmaceuticals, Inc. Stockholders (Tables) | 3 Months Ended
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Mar. 31, 2023
Income per Share Attributable to Amphastar Pharmaceuticals, Inc. Stockholders |
Schedule of basic and diluted net income (loss) per share calculation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | March 31,
​ | ​ | 2023 | ​ | 2022
​ | ​ | (in thousands, except per share data)
Basic and dilutive numerator: |  | ​ |  |  | ​ |
Net income | ​ | $ | 26,032 | ​ | $ | 24,253
Denominator: | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average shares outstanding — basic | ​ |  | 48,000 | ​ | ​ | 48,138
​ | ​ | ​ | ​ | ​ | ​ | ​
Net effect of dilutive securities: | ​ | ​ | ​ | ​ | ​ | ​
Incremental shares from equity awards | ​ |  | 3,970 | ​ | ​ | 3,841
Weighted-average shares outstanding — diluted | ​ |  | 51,970 | ​ |  | 51,979
Net income per share — basic | ​ | $ | 0.54 | ​ | $ | 0.50
Net income per share — diluted | ​ | $ | 0.50 | ​ | $ | 0.47

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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 https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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