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Deferred Royalty Obligation (Details) $ in Thousands	4 Months Ended
	Dec. 31, 2024 USD ($)
Deferred Royalty Obligation
Acquired balance	$ 116,900
Accretion interest expense	3,713
Net carrying amount	$ 120,613

X

- Definition

Amount of interest expense accrued to deferred royalty obligation during the period.

+ References

No definition available.

+ Details

Name:	coll_DeferredRoyaltyAccretionInterestExpense
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