REVENUE RECOGNITION AND RELATED ALLOWANCES - Allowances (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Accruals and allowances
Beginning balance	$ 105,260
Ending balance	113,970
Chargebacks
Accruals and allowances
Beginning balance	94,066	$ 88,746
Accruals/Adjustments	152,566	96,701
Credits Taken Against Reserve	(142,991)	(114,114)
Ending balance	103,641	71,333
Government Rebates
Accruals and allowances
Beginning balance	5,492	7,826
Accruals/Adjustments	2,810	4,656
Credits Taken Against Reserve	(3,745)	(3,810)
Ending balance	4,557	8,672
Returns
Accruals and allowances
Beginning balance	35,831	27,155
Accruals/Adjustments	6,942	4,811
Credits Taken Against Reserve	(7,219)	(3,022)
Ending balance	35,554	28,944
Administrative Fees and Other Rebates
Accruals and allowances
Beginning balance	13,100	8,906
Accruals/Adjustments	9,785	7,634
Credits Taken Against Reserve	(10,915)	(9,184)
Ending balance	11,970	7,356
Prompt Payment Discounts
Accruals and allowances
Beginning balance	4,642	3,839
Accruals/Adjustments	5,060	3,196
Credits Taken Against Reserve	(4,539)	(3,959)
Ending balance	$ 5,163	$ 3,076

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.

+ Details

Name:	srt_ValuationAndQualifyingAccountsDisclosureLineItems
Namespace Prefix:	srt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690

+ Details

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

- Definition

Amount of valuation and qualifying accounts and reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09(Column B))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09(Column E))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690

+ Details

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

- Definition

Amount of decrease in valuation and qualifying accounts and reserves.

+ References

+ Details

Name:	us-gaap_ValuationAllowancesAndReservesDeductions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_ValuationAllowancesAndReservesTypeAxis=anip_ChargebacksMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ValuationAllowancesAndReservesTypeAxis=anip_GovernmentRebatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ValuationAllowancesAndReservesTypeAxis=anip_AllowancesForSalesReturnsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ValuationAllowancesAndReservesTypeAxis=anip_AdministrativeFeesAndOtherRebatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ValuationAllowancesAndReservesTypeAxis=anip_ReservesForCashDiscountMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: