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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($)
CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY |
Equity component of 2020 Convertible Notes, issuance costs | $ 1,773

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- Definition The adjustments to additional paid in capital due to equity component of the transaction cost of the convertible debt. + References No definition available. + Details
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Namespace Prefix: | coll_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | coll_StatementOfTemporaryEquityAbstract
Namespace Prefix: | coll_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration