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v3.22.1

Summary of Significant Accounting Policies - Research and Development (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Funds Received | $ 44 | $ 40
Engineering and installation |  |
Funds Received |  | $ 50

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- Definition Amount provide funding of research and development costs over periods + References No definition available. + Details
Name: | clir_FundsReceived
Namespace Prefix: | clir_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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