Revenue Recognition (Analysis of the Chargeback Provision) (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015
Revenue Recognition
Beginning balance	$ 15,217	$ 11,872
Provision related to sales made in the current period	105,772	121,714
Credits issued to third parties	(110,073)	(121,914)
Ending balance	$ 10,916	$ 11,672

Represents the amount the Company agrees to reimburse wholesalers for differences between the gross sales prices, at which the Company sells its products to wholesalers and the actual prices of such products at the time wholesalers resell them under the Company’s various contractual arrangements with third parties such as hospitals and group purchasing organizations.

No definition available.

Name:	amph_RevenueRecognitionWholesalerChargebacks
Namespace Prefix:	amph_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant