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v3.21.1

Equity - Warrants - Activity (Details) - $ / shares | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2018
Equity |  |  |
Warrants Outstanding at beginning of period (in shares) | 2,495,784 |  |
Warrants Forfeited/Expired (in shares) | (2,415,784) |  |
Warrants Outstanding at end of period (in shares) | 80,000 |  |
Weighted Average Exercise Price, Warrants Outstanding (in dollars per share) | $ 1.80 | $ 1.80 | $ 3.98
Weighted Average Exercise Price, Warrants Forfeited/Expired (in dollars per share) | $ 4.05 |  |

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