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Revenue from Contracts with Customers - Contract Liabilities (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Rebates and Incentives
Allowance categories
Balance at beginning of the period	$ 129,318
Provision related to current period sales	128,509
Changes in estimate related to prior period sales	(3,017)
Credits/payments made	(119,659)
Balance at end of the period	135,151
Product Returns
Allowance categories
Balance at beginning of the period	15,465
Provision related to current period sales	9,150
Credits/payments made	(1,502)
Balance at end of the period	23,113
Trade Allowances and Chargebacks
Allowance categories
Balance at beginning of the period	14,841
Provision related to current period sales	31,988
Credits/payments made	(32,673)
Balance at end of the period	$ 14,156

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

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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Balance Type:	debit
Period Type:	duration

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

No definition available.

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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 http://asc.fasb.org/extlink&oid=118944033&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 http://asc.fasb.org/extlink&oid=118956577&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 http://asc.fasb.org/extlink&oid=118944033&loc=SL49130532-203044

+ Details

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Period Type:	instant

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- Details

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- Details

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- Details

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