Name:	asrt_CashDiscountToCustomerForPromptPaymentAsPercentageOfSalesPrice
Namespace Prefix:	asrt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Contract With Customer, Managed Care Rebate Liability, Period After Quarter In Which Prescription Is Filled

No definition available.

Name:	asrt_ContractWithCustomerManagedCareRebateLiabilityPeriodAfterQuarterInWhichPrescriptionIsFilled
Namespace Prefix:	asrt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Contract With Customer, Medicare Part D Coverage Gap Rebate Liability, Period After Quarter In Which Prescription Is Filled

No definition available.

Name:	asrt_ContractWithCustomerMedicarePartDCoverageGapRebateLiabilityPeriodAfterQuarterInWhichPrescriptionIsFilled
Namespace Prefix:	asrt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the discount reimbursement period after filling of prescription subject to discount.

No definition available.

Name:	asrt_DiscountReimbursementPeriodAfterFillingOfPrescriptionSubjectToDiscount
Namespace Prefix:	asrt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the discount taken off period after the quarter in which product shipped to the customer under certain wholesaler and retail pharmacy discounts.

No definition available.

Name:	asrt_DiscountTakenOffPeriodAfterQuarterInWhichProductShippedToCustomer
Namespace Prefix:	asrt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the period after the quarter in which prescription is filled for paying rebate to each participating state under the Medicaid rebate programs.

No definition available.

Name:	asrt_PeriodAfterQuarterInWhichPrescriptionIsFilledForPayingRebate
Namespace Prefix:	asrt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the period after expiration of a product within which the entity accepts return of unsalable product from customers.

No definition available.

Name:	asrt_ProductReturnPeriodAfterExpirationDate
Namespace Prefix:	asrt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the period prior to expiration of a product within which the entity accepts return of unsalable product from customers.

No definition available.

Name:	asrt_ProductReturnPeriodPriorToExpirationDate
Namespace Prefix:	asrt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the product shelf-life from the manufacturing date.

No definition available.

Name:	asrt_ProductShelfLifeFromDateOfManufacturing
Namespace Prefix:	asrt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the typical collection period for receivables after product delivery, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	asrt_ReceivablesCollectionPeriod
Namespace Prefix:	asrt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

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

Name:	srt_ProductOrServiceAxis=asrt_ZipsorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_ProductOrServiceAxis=asrt_NucyntaErAndNucyntaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_ProductOrServiceAxis=asrt_GraliseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_ProductOrServiceAxis=asrt_CAMBIAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_ProductOrServiceAxis=asrt_LazandaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: