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Nature of Business (Details) - Nucynta Products - USD ($) $ in Thousands |  | 1 Months Ended
--- | --- | ---
Feb. 13, 2020 | Feb. 29, 2020
Assertio | Nucynta Purchase Agreement |  |
Aggregate purchase price |  | $ 375,000
Grnenthal |  |
Royalty payment as percentage of annual net sales | 14.00% |
Grnenthal | Nucynta Purchase Agreement |  |
Aggregate purchase price | $ 375,000 |
Royalty payment as percentage of annual net sales | 14.00% |

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- Definition Amount of purchase price for asset purchase agreement. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Represents the royalty payment as percentage of annual net sales. + References No definition available. + Details
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Namespace Prefix: | coll_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=coll_NucyntaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |