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License Agreements - License and supply agreement (Details) - Shionogi license and supply agreement	Apr. 04, 2019
License Agreements [Line Items]
Additional Percentage	1.00%
Minimum
License Agreements [Line Items]
Royalty Percentage	8.50%
Maximum
License Agreements [Line Items]
Royalty Percentage	17.50%

X

- Definition

Additional percentage of net sales on a pass through basis to a third party licensor payable under the license agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	coll_
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Period Type:	duration

X

- Definition

Percentage of royalty payable under the license agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	coll_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represents license agreements.

+ References

No definition available.

+ Details

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Namespace Prefix:	coll_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
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