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v3.22.1

Summary of Significant Accounting Policies - Noncontrolling interest (Details) | Dec. 31, 2021 | Dec. 31, 2020
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Minority Shareholder (Member) |  |
Variable Interest Entity [Line Items] |  |
Minority shareholder ownership interest percentage | 1.00% | 1.00%

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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_OwnershipAxis=clir_MinorityShareholderMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |