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Inventory (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Inventory
Raw materials	$ 8,335	$ 12,531
Work in process	11,629	13,163
Finished goods	20,242	17,812
Total inventory	$ 40,206	$ 43,506

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

Name:	coll_InventoryCurrentAndNoncurrent
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

Name:	coll_InventoryFinishedGoodsCurrentAndNoncurrent
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

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

X

- Definition

Amount of merchandise or goods in the production process.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_InventoryDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration