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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