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v3.23.1

Equity - Warrants - Activity (Details) - $ / shares shares in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Equity |  |
Warrants Outstanding at beginning of period (in shares) | 80 |
Warrants Exercised (in shares) | (38) |
Warrants Forfeited/Expired (in shares) | (43) |
Weighted Average Exercise Price, Warrants Outstanding (in dollars per share) |  | $ 1.80
Weighted Average Exercise Price, Warrants Exercised (in dollars per share) | $ 1.80 |
Weighted Average Exercise Price, Warrants Forfeited/Expired (in dollars per share) | $ 1.80 |

X
- Definition Number of warrants or rights exercised during the period. + References No definition available. + Details
Name: | clir_ClassOfWarrantOrRightExercised
Namespace Prefix: | clir_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of warrants or rights forfeited or expired during the period. + References No definition available. + Details
Name: | clir_ClassOfWarrantOrRightForfeitedOrExpired
Namespace Prefix: | clir_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average exercise price of warrants exercised during the period. + References No definition available. + Details
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Namespace Prefix: | clir_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average exercise price of warrants forfeited or expired during the period. + References No definition available. + Details
Name: | clir_ClassOfWarrantOrRightWeightedAverageExercisePriceForfeitedOrExpired
Namespace Prefix: | clir_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average exercise price of warrants outstanding. + References No definition available. + Details
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Namespace Prefix: | clir_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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