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Commitments and Contingencies (Details 3) - Drug delivery system item in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2015 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_ProductOrServiceAxis=amph_DrugDeliverySystemMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: