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v3.21.1

Equity - Warrants - Exercise price and average life (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Warrants |  |  |
Warrants Outstanding (in shares) | 80,000 | 80,000 | 2,495,784
Intrinsic value of warrants (in dollars) | $ 90,000 |  |
Exercise Price 1.80 [Member] |  |  |
Warrants |  |  |
Warrants Exercise Price (in dollars per share) | $ 1.80 |  |
Warrants Outstanding (in shares) | 80,000 |  |
Warrants Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 1.80 |  |
Warrant Outstanding, Remaining Life | 1 month 17 days |  |

X
- Definition Exercise price of the warrants. + References No definition available. + Details
Name: | clir_WarrantsExercisePrice
Namespace Prefix: | clir_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of intrinsic value of warrants. + References No definition available. + Details
Name: | clir_WarrantsIntrinsicValue
Namespace Prefix: | clir_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The remaining life of warrants outstanding. + References No definition available. + Details
Name: | clir_WarrantsOutstandingRemainingLife
Namespace Prefix: | clir_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- 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_ClassOfWarrantOrRightLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=clir_Warrant1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |