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Royalty Purchase and Sale Agreement - Summarizes the Activity of the HCR Agreement (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 USD ($)
Royalty Purchase And Sale Agreement [Line Items] |
Royalty purchase and sale agreement balance at December 31, 2023 | $ 37,079
Non-cash interest expense | 1,982
Balance at March 31, 2024 | 38,376
HCR Agreement [Member] |
Royalty Purchase And Sale Agreement [Line Items] |
Royalty purchase and sale agreement balance at December 31, 2023 | 37,079
Payments | (685)
Non-cash interest expense | 1,982
Balance at March 31, 2024 | $ 38,376
Effective interest rate | 22.56%

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- Definition Represents the effective interest rate of HCR agreement. + References No definition available. + Details
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Namespace Prefix: | cara_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of non-cash interest expense on liability related to sales of future royalties and milestones. + References No definition available. + Details
Name: | cara_NonCashInterestExpenseOnLiabilityRelatedToSalesOfFutureRoyaltiesAndMilestones
Namespace Prefix: | cara_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items representing royalty purchase and sale agreement. + References No definition available. + Details
Name: | cara_RoyaltyPurchaseAndSaleAgreementLineItems
Namespace Prefix: | cara_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of payments of royalty purchase and sale. + References No definition available. + Details
Name: | cara_RoyaltyPurchaseAndSaleAgreementPayments
Namespace Prefix: | cara_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount the entity has committed to make for future royalty guarantees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 928 -SubTopic 440 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483119/928-440-50-1 + Details
Name: | us-gaap_RoyaltyGuaranteesCommitmentsAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_TypeOfArrangementAxis=cara_HcrAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |