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License Agreements - License and supply agreement (Details) - Shionogi license and supply agreement | Apr. 04, 2019
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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
Name: | coll_LicenseAgreementAdditionalPercentageOfNetSalesOnPassThroughBasisPayableToThirdPartyLicensor
Namespace Prefix: | coll_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of royalty payable under the license agreement. + References No definition available. + Details
Name: | coll_LicenseAgreementRoyaltyPercentage
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
Name: | coll_LicenseAgreementsLineItems
Namespace Prefix: | coll_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=coll_ShionogiLicenseAndSupplyAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |