Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2016	Dec. 31, 2015
Fair Value Measurements
Assets, Fair Value Adjustment	$ 0	$ 0
Liabilities, Fair Value Adjustment	$ 0	$ 0

Amount of addition (reduction) to the amount at which a nonfinancial liability could be incurred (settled) in a current transaction between willing parties.

No definition available.

Name:	amph_NonfinancialLiabilitiesFairValueAdjustment
Namespace Prefix:	amph_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration