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Deferred Royalty Obligation - Rollforward (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2025 USD ($)
Deferred Royalty Obligation
Beginning balance	$ 120,613
Net accretion	1,666
Net carrying amount	$ 122,279

X

- Definition

The amount of net accretions adjusted with deferred royalty obligations, during the period.

+ References

No definition available.

+ Details

Name:	coll_DeferredRoyaltyLiabilityAccretionsNet
Namespace Prefix:	coll_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of liability recognized arising from deferred royalty, expected to be settled beyond one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

Name:	coll_DeferredRoyaltyLiabilityNonCurrent
Namespace Prefix:	coll_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	coll_DeferredRoyaltyObligationAbstract
Namespace Prefix:	coll_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration