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Revenue from Contracts with Customers - Product Revenue Provision and Allowance Categories (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Allowance categories
Previously credited product returns		$ 12,960
Rebates and Incentives
Allowance categories
Balance at beginning of the period	$ 142,379	132,775
Acquired from BDSI	38,074
Provision related to current period sales	368,880	273,576
Changes in estimate related to prior period sales	(304)	(434)
Credits/payments made	(385,298)	(261,210)
Balance at end of the period	163,731	144,707
Product Returns
Allowance categories
Balance at beginning of the period	54,617	23,779
Acquired from BDSI	18,187
Provision related to current period sales	26,508	13,750
Changes in estimate related to prior period sales	(838)
Credits/payments made	(20,987)	(3,473)
Credits expired		12,960
Balance at end of the period	77,487	47,016
Trade Allowances and Chargebacks
Allowance categories
Balance at beginning of the period	13,226	19,055
Acquired from BDSI	7,575
Provision related to current period sales	94,859	63,279
Changes in estimate related to prior period sales	(580)	6
Credits/payments made	(93,946)	(58,213)
Balance at end of the period	$ 21,134	$ 24,127

X

- Definition

Assumed liability related to product sales

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of increase (decrease) in contract liability due to change in estimation of prior period sales.

+ References

No definition available.

+ Details

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X

- Definition

Amount of increase in contract liability due to credits expired.

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

Amount of decrease in contract liability due to payments made.

+ References

No definition available.

+ Details

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Namespace Prefix:	coll_
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X

- Definition

Amount of increase (decrease) in contract liability due to change in provision for current period sales.

+ References

No definition available.

+ Details

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Namespace Prefix:	coll_
Data Type:	xbrli:monetaryItemType
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- References

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X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130531-203044

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130532-203044

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X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045

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