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Prepaid Expenses and Other Current Assets - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |  |
R&D tax credit, potential receivable | $ 7.3 | $ 7.0 | $ 4.1

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- Definition Research And Development, Tax Credit, Potential Receivable + References No definition available. + Details
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Namespace Prefix: | cmps_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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