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Inventory (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Raw materials	$ 11,843		$ 12,531
Work in process	11,612		13,163
Finished goods	18,459		17,812
Total inventory	41,914		$ 43,506
Cost of product revenues
Expenses related to excess and obsolete inventory	$ 3	$ 373

X

- Definition

Amount of inventory expected to be sold, or consumed within one year or operating cycle, if longer and more than one year i.e., current and non current.

+ References

No definition available.

+ Details

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Namespace Prefix:	coll_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of completed merchandise or goods.

+ References

No definition available.

+ Details

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Namespace Prefix:	coll_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of raw materials expected to be sold, or consumed.

+ References

No definition available.

+ Details

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Namespace Prefix:	coll_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Amount of merchandise or goods in the production process.

+ References

No definition available.

+ Details

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Namespace Prefix:	coll_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 330
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483080/330-10-50-2

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Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: