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

X

- 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

Name:	coll_AdjustmentsToAdditionalPaidInCapitalConvertibleDebtEquityComponentOfTransactionCosts
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