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Related-Party Transactions (Details) - USD ($) $ in Millions	1 Months Ended
	Sep. 30, 2021	Aug. 31, 2021	May 31, 2021
Hanxin
Related Party Transaction [Line Items]
Ownership after transaction	14.00%
Hanxin | Service Fee
Related Party Transaction [Line Items]
Related Party Transaction, Due from (to) Related Party	$ 2.5
ANP
Related Party Transaction [Line Items]
Ownership after transaction		100.00%	85.00%

X

- Definition

Percentage of ownership in investment after spin-off transaction.

+ References

No definition available.

+ Details

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Namespace Prefix:	amph_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=amph_NanjingHanxinPharmaceuticalTechnologyCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=amph_ServiceFeeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=amph_AnpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: