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Nature of Business (Details) - Nucynta Products - USD ($) $ in Thousands		1 Months Ended
	Feb. 13, 2020	Feb. 29, 2020
Assertio | Nucynta Purchase Agreement
Aggregate purchase price		$ 375,000
Grnenthal
Royalty payment as percentage of annual net sales	14.00%
Grnenthal | Nucynta Purchase Agreement
Aggregate purchase price	$ 375,000
Royalty payment as percentage of annual net sales	14.00%

X

- Definition

Amount of purchase price for asset purchase agreement.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the royalty payment as percentage of annual net sales.

+ References

No definition available.

+ Details

Name:	coll_CollaborativeArrangementRoyaltyPaymentAsPercentageOfAnnualNetSales
Namespace Prefix:	coll_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_CounterpartyNameAxis=coll_AssertioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=coll_AssetPurchaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=coll_NucyntaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CounterpartyNameAxis=coll_GrnenthalGmbhMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: