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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Fair Value Measurements
Assets, Fair Value Adjustment	$ 0	$ 0
Liabilities, Fair Value Adjustment	$ 0	$ 0

X

- Definition

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

+ References

No definition available.

+ Details

Name:	amph_NonfinancialAssetsFairValueAdjustment
Namespace Prefix:	amph_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_FairValueDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration