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Fixed Assets and Operating Leases - Additional information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Leases
Depreciation expense	$ 38	$ 54
Interest on future minimum payments	63
Seattle and Tulsa
Leases
Estimated restoration cost	32
Monthly rent expense	24
CHINA
Leases
Short term monthly rent expense	$ 5
Minimum [Member] | Seattle and Tulsa
Leases
Remaining term (in years)	1 year
Annual rent expense, increase (in percent)	2.00%
Agreement expiration term (in years)	12 months
Maximum [Member] | Seattle and Tulsa
Leases
Remaining term (in years)	6 years
Annual rent expense, increase (in percent)	3.00%
Agreement expiration term (in years)	6 years

X

- Definition

Represents monthly rent expense. Excludes triple net operating costs.

+ References

No definition available.

+ Details

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Namespace Prefix:	clir_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Represents short term of monthly rent expense.

+ References

No definition available.

+ Details

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- Definition

Represents percentage of Annual rent expense increase. Excludes triple net operating costs.

+ References

No definition available.

+ Details

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X

- Definition

Amount of provision for restoration cost.

+ References

No definition available.

+ Details

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X

- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 45
-Paragraph 28
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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

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X

- Definition

Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980

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Balance Type:	credit
Period Type:	instant

X

- Definition

Remaining lease term of operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980

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- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980

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