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v3.25.3

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