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Income per Share Attributable to Amphastar Pharmaceuticals, Inc. Stockholders (Calculation of Basic and Diluted Net Income (Loss) Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Basic and dilutive numerator:    
Net Income (Loss) Attributable to Parent $ 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 (loss) per share - basic $ 0.54 $ 0.50
Net income (loss) per share - diluted $ 0.50 $ 0.47