Name:	amph_LongTermSupplyCommitmentOptionalRenewalPeriod
Namespace Prefix:	amph_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The period of time after termination of the agreement within which the counterparty is required to pay the full amount of all unpaid purchase commitments due over the initial term.

No definition available.

Name:	amph_PaymentPeriodUponTermination
Namespace Prefix:	amph_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The minimum annual amount which the counterparty has agreed to purchase under the supply commitment.

No definition available.

Name:	amph_SignificantSupplyCommitmentAnnualAmountCommitted
Namespace Prefix:	amph_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The period of time which the counterparty is required to give in order to exercise the renewal option.

No definition available.

Name:	amph_SupplyAgreementRenewalNoticePeriod
Namespace Prefix:	amph_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The period of time which the counterparty is required to give in order to terminate the agreement if there is a change in regulatory approval.

No definition available.

Name:	amph_SupplyAgreementTerminationNoticePeriodChangeOfRegulatoryApproval
Namespace Prefix:	amph_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The period of time which the counterparty is required to give in order to terminate the agreement without cause.

No definition available.

Name:	amph_SupplyAgreementterminationNoticePeriodWithoutCause
Namespace Prefix:	amph_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response)
-URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 13
-Section A

Name:	us-gaap_DeferredRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a))
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Name:	us-gaap_SalesRevenueGoodsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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.

No definition available.