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FAIR VALUE MEASUREMENTS - Earnout Consideration (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Derivative Instrument, Contingent Consideration, Liability [Roll Forward] |  |  |  |
Estimated fair value at December 31, 2021 |  |  | $ 38,427 |
Change in estimated fair value | $ (14,934) | $ 0 | (19,041) | $ 0
Estimated fair value at June 30, 2022 | $ 19,386 |  | $ 19,386 |

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- Definition Derivative Instrument, Change In Amount Of Contingent Consideration, Liability + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Derivative Instrument, Contingent Consideration, Liability + References No definition available. + Details
Name: | cmpo_DerivativeInstrumentContingentConsiderationLiability
Namespace Prefix: | cmpo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Derivative Instrument, Contingent Consideration, Liability + References No definition available. + Details
Name: | cmpo_DerivativeInstrumentContingentConsiderationLiabilityRollForward
Namespace Prefix: | cmpo_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration