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Equity - Warrants - Exercise price and average life (Details) - Exercise Price 1.80 [Member] | 6 Months Ended
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Jun. 30, 2020 $ / shares shares
Warrants |
Warrants Exercise Price (in dollars per share) | $ / shares | $ 1.80
Warrants Outstanding (in shares) | shares | 80,000
Warrant Outstanding, Remaining Life | 7 months 17 days

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- 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

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- 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

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- 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

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- 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
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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