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Marketable Securities - Narratives (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2024
Marketable Securities |  |
Proceeds from sale of marketable securities | $ 0 | $ 0

X
- Definition The cash inflow associated with the aggregate amount received by the entity through sale of marketable securities (held-to-maturity or available-for-sale) during the period. + References No definition available. + Details
Name: | coll_SaleOfMarketableSecurities
Namespace Prefix: | coll_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration