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Summary of Significant Accounting Policies - Research and Development (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Summary of Significant Accounting Policies |  |
Funds received | $ 40,000 | $ 108,000

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

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration