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Intangible Assets - Minimum Royalty Payments - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2018 | Jun. 30, 2019
Intangible Assets |  |
Total remaining minimum royalty payments due |  | $ 537,000
2018 |  | 132,000
2019 |  | 135,000
2020 |  | 135,000
2021 |  | 135,000
Fair Value of royalty payments |  | $ 482,300
Discounted cash flow rate |  | 5.70%
Interest expense recognized |  | $ 54,700
Interest expense recognized, relating to royalty payments, prior to third amendment | $ 19,281 |
Amortization expense recognized prior to third amendment | $ 107,662 |

X
- Definition Amortization expense recognized, relating to royalty payments, prior to third amendment. + References No definition available. + Details
Name: | coll_AmortizationExpenseRecognizedRelatingToRoyaltyPaymentsPriorToThirdAmendment
Namespace Prefix: | coll_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The percentage of rate used to discounted the cash flows of future payments. + References No definition available. + Details
Name: | coll_DiscountedCashFlowRate
Namespace Prefix: | coll_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Interest expense recognized, relating to royalty payments, prior to third amendment + References No definition available. + Details
Name: | coll_InterestExpenseRecognizedRelatingToRoyaltyPaymentsPriorToThirdAmendment
Namespace Prefix: | coll_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of royalty treated as interest expense. + References No definition available. + Details
Name: | coll_InterestExpenseRoyalty
Namespace Prefix: | coll_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of fair value of minimum royalty payable. + References No definition available. + Details
Name: | coll_RoyaltyPayableFairValue
Namespace Prefix: | coll_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of future royalty payments during remainder of fiscal year. + References No definition available. + Details
Name: | coll_RoyaltyPayableRemainderOfFiscalYear
Namespace Prefix: | coll_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of future royalty payments in year four. + References No definition available. + Details
Name: | coll_RoyaltyPayableYearFour
Namespace Prefix: | coll_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of future royalty payments in year three. + References No definition available. + Details
Name: | coll_RoyaltyPayableYearThree
Namespace Prefix: | coll_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of future royalty payments in year two. + References No definition available. + Details
Name: | coll_RoyaltyPayableYearTwo
Namespace Prefix: | coll_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of minimum royalty payments to be made. + References No definition available. + Details
Name: | coll_RoyaltyPaymentDue
Namespace Prefix: | coll_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration