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Commitments and Contingencies (Collaboration Agreement) (Details) - Development agreement - Drug delivery system item in Millions, $ in Millions | 3 Months Ended
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Mar. 31, 2016 USD ($) item
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |
Collaborative Agreement, Upfront Payment | $ 0.5
Collaborative Agreement, Milestone Payments | 0.4
Collaborative Agreement, Contingent Obligation | $ 1.7
Collaborative Agreement, Contingent Purchase Obligation First 12 Months, Units | item | 1.0
Purchase period | 12 months

X
- Definition The obligation to make payment if certain milestones are met as part of the collaboration agreement. + References No definition available. + Details
Name: | amph_CollaborativeAgreementContingentObligation
Namespace Prefix: | amph_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The number of units the company has committed to purchase in the first 12 months if development is successful in a collaboration agreement. + References No definition available. + Details
Name: | amph_CollaborativeAgreementContingentPurchaseObligationFirst12MonthsUnits
Namespace Prefix: | amph_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The period of time in which the reporting entity intends to purchase a specified minimun amount if development is successful. + References No definition available. + Details
Name: | amph_CollaborativeAgreementContingentPurchaseObligationPeriodOfTime
Namespace Prefix: | amph_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The milestone payments since inception of the collaboration agreement. + References No definition available. + Details
Name: | amph_CollaborativeAgreementMilestonePayments
Namespace Prefix: | amph_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The upfront payment since inception of the collaboration agreement. + References No definition available. + Details
Name: | amph_CollaborativeAgreementUpfrontPayment
Namespace Prefix: | amph_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=amph_DevelopmentAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ProductOrServiceAxis=amph_DrugDeliverySystemMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |