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Revenue Recognition (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Revenue Recognition |  |
Beginning balance | $ 11,872 | $ 18,104
Provision related to sales made in the current period | 162,238 | 156,235
Credits issued to third parties | (158,893) | (162,467)
Ending balance | $ 15,217 | $ 11,872

X
- Definition 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. + References No definition available. + Details
Name: | amph_RevenueRecognitionWholesalerChargebacks
Namespace Prefix: | amph_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents wholesaler chargeback credits issued to third parties during the period. + References No definition available. + Details
Name: | amph_RevenueRecognitionWholesalerChargebacksCreditsIssuedToThirdParties
Namespace Prefix: | amph_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the wholesaler chargeback provision related to sales made in the current period. + References No definition available. + Details
Name: | amph_RevenueRecognitionWholesalerChargebacksProvisionRelatedToSalesInPeriod
Namespace Prefix: | amph_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_RevenueRecognitionAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration