| Component: (Network and Table) | |
|---|---|
| Network | 41001 - Disclosure - Inventories (Details) (http://www.amphastar.com/role/DisclosureInventoriesDetails) | 
| Table | (Implied) | 
| Reporting Entity [Axis] | 0001297184 (http://www.sec.gov/CIK) | 
| Inventories | Period [Axis] | |
|---|---|---|
| 2016-12-31 | 2015-12-31 | |
| Inventories | ||
| Raw materials and supplies | ||
| Work in process | ||
| Finished goods | ||
| Total inventory, net | 79,754,000   | 70,665,000   |