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COMMITMENTS AND CONTINGENCIES - Supply Agreements (Details) $ in Millions | Sep. 30, 2023 USD ($)
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Supply Commitment [Line Items] |
Purchase obligation, percentage | 75.00%
Cosette |
Supply Commitment [Line Items] |
Annual purchase obligation | $ 6.3
Antares |
Supply Commitment [Line Items] |
Annual purchase obligation | 2.0
Supply Agreement | JHS |
Supply Commitment [Line Items] |
Annual purchase obligation | $ 1.0

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- Definition Purchase Obligation, Annual Obligation + References No definition available. + Details
Name: | asrt_PurchaseObligationAnnualObligation
Namespace Prefix: | asrt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Purchase Obligation, Percentage + References No definition available. + Details
Name: | asrt_PurchaseObligationPercentage
Namespace Prefix: | asrt_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

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

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- Details
Name: | srt_CounterpartyNameAxis=asrt_CosetteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CounterpartyNameAxis=asrt_AntaresMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SupplyCommitmentAxis=us-gaap_SupplyCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CounterpartyNameAxis=asrt_JubilantHollisterStierLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |