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Deferred Royalty Obligation -Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Deferred Royalty Obligation |  |
Effective interest rate | 11.88% |
Interest expense on deferred royalty obligation | $ 10,841 | $ 1,526
Net accretion for deferred royalty obligation | 1,666 | $ 473
Total royalty payments | $ 8,582 |
Net sales prior to July 1, 2025 |  |
Deferred Royalty Obligation |  |
Royalty rate | 7.40% |
Net sales after July 1, 2025 and up to March, 2032. |  |
Deferred Royalty Obligation |  |
Royalty rate | 9.70% |

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- Definition Line items represent information about deferred royalty liability. + References No definition available. + Details
Name: | coll_DeferredRoyaltyLiabilityLineItems
Namespace Prefix: | coll_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Effective interest rate for the deferred royalty obligations. + References No definition available. + Details
Name: | coll_DeferredRoyaltyObligationInterestRateEffectivePercentage
Namespace Prefix: | coll_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of interest expense recognized during the period towards deferred royalty liability obligation. + References No definition available. + Details
Name: | coll_InterestExpenseOnDeferredRoyaltyLiability
Namespace Prefix: | coll_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of net accretion from deferred royalty obligation. + References No definition available. + Details
Name: | coll_NetAccretionForDeferredRoyaltyObligation
Namespace Prefix: | coll_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of deferred royalty obligation paid during the period. + References No definition available. + Details
Name: | coll_PaymentOfDeferredRoyaltyObligation
Namespace Prefix: | coll_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Percentage of royalty amount agreed to be paid upon net sales. + References No definition available. + Details
Name: | coll_RoyaltyRatePercent
Namespace Prefix: | coll_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | srt_StatementScenarioAxis=coll_NetSalesPriorToJuly12025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementScenarioAxis=coll_NetSalesPriorAfterJuly12025AndUpToMarch2032Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |