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Deferred Royalty Obligations -Narrative (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2024 USD ($)
Deferred Royalty Obligation
Initial effective interest rate	15.20%	15.20%
Interest expense on deferred royalty obligation	$ 1,526	$ 1,526
Net sales prior to July 1, 2025
Deferred Royalty Obligation
Royalty rate	7.40%	7.40%
Net sales after July 1, 2025 and up to March, 2032.
Deferred Royalty Obligation
Royalty rate	9.70%	9.70%

X

- 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

X

- 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

X

- 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

X

- 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

X

- Details

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

X

- Details

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