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Equity - Warrants - Activity (Details) - $ / shares | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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 | $ 3.98 | $ 3.98
Weighted Average Exercise Price, Warrants Forfeited/Expired (in dollars per share) | $ 4.05 |  |

X
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X
- Definition The weighted average exercise price of warrants forfeited or expired during the period. + References No definition available. + Details
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Namespace Prefix: | clir_
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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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