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Equity - Equity Incentive Plan (Details) - shares	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Equity Incentive Plan [Member]
Share-based compensation
Outstanding options and restricted stock units	3,332,000	3,202,000
Reserved but unissued shares under the Plans	2,530,000	2,777,000
Number of shares authorized	5,862,000	5,979,000
Increases in the number of authorized shares	400,000
2021 Plan
Share-based compensation
Maximum number of shares that may be issued as a proportion of outstanding stock	10.00%
Maximum increase in number of shares available for issuance	400,000

X

- Definition

The number of shares of stock already awarded under the share-based compensation plan, including options and restricted stock units.

+ References

No definition available.

+ Details

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Namespace Prefix:	clir_
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Period Type:	instant

X

- Definition

Maximum increase in shares available for issuance under share based payment awards.

+ References

No definition available.

+ Details

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Namespace Prefix:	clir_
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X

- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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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.

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X

- Definition

Number of additional shares authorized for issuance under share-based payment arrangement.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Number of shares authorized for issuance under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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X

- Definition

Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

+ References

No definition available.

+ Details

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- Details

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- Details

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