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License Agreements - Acquired product rights (Details) - Elyxyb asset purchase agreement $ in Thousands	Aug. 03, 2022 USD ($) item
License Agreements [Line Items]
Amount payable	$ 9,000
Contingent consideration	$ 9,000
Number of sales milestone achievement | item	6
Maximum consideration	$ 262,000
Minimum
License Agreements [Line Items]
Payment upon sales milestone achievement , Per Year	4,000
Sales milestone achievement	50,000
Maximum
License Agreements [Line Items]
Payment upon sales milestone achievement , Per Year	100,000
Sales milestone achievement	$ 1,000,000

X

- Definition

Amount payable as consideration under asset acquisition.

+ References

No definition available.

+ Details

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Namespace Prefix:	coll_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Maximum amount of contingent consideration payable upon achievement of sales milestone.

+ References

No definition available.

+ Details

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Namespace Prefix:	coll_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Number of escalating sales milestone achievement to entitle the one time contingent payment.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of contingent consideration payable per year upon achievement of sales milestone.

+ References

No definition available.

+ Details

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Namespace Prefix:	coll_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The sales milestone achieved to trigger contingent consideration.

+ References

No definition available.

+ Details

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Namespace Prefix:	coll_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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
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X

- Definition

Amount of contingent consideration recognized as part of consideration transferred in asset acquisition.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 50
-Section 30
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=126928898&loc=d3e9212-128498

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 50
-Section 25
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=127000608&loc=d3e9135-128495

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 50
-Section 30
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=126928898&loc=d3e9215-128498

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Period Type:	duration

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- Details

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- Details

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