XML 22 R11.htm IDEA: XBRL DOCUMENT
v3.23.1

Income per Share Attributable to Amphastar Pharmaceuticals, Inc. Stockholders | 3 Months Ended
--- | ---
Mar. 31, 2023
Income per Share Attributable to Amphastar Pharmaceuticals, Inc. Stockholders |
Income per Share Attributable to Amphastar Pharmaceuticals, Inc. Stockholders | Note 4. Net Income per Share ​ Basic net income per share is calculated based upon the weighted-average number of shares outstanding during the period. Diluted net income per share gives effect to all potential dilutive shares outstanding during the period, such as stock options, non-vested restricted stock units and shares issuable under the Company’s Employee Stock Purchase Plan, or ESPP. ​ For the three months ended March 31, 2023, options to purchase 1,403,859 shares of stock with a weighted-average exercise price of $34.96 per share were excluded from the computation of diluted net income per share because their effect would be anti-dilutive. ​ For the three months ended March 31, 2022, options to purchase 706,740 shares of stock with a weighted-average exercise price of $34.74 per share were excluded from the computation of diluted net income per share because their effect would be anti-dilutive. ​ The following table provides the calculation of basic and diluted net income per share for each of the periods presented: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
​

X
- References No definition available. + Details
Name: | us-gaap_EarningsPerShareAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI https://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3630-109257 + Details
Name: | us-gaap_EarningsPerShareTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration