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Equity - Stock Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Equity
Fair value of stock payments in accrued compensation, Number of Shares			326	307
Fair value of stock payments in accrued compensation, Fair Value	$ 279	$ 326	$ 279	$ 326
Fair value of stock payments in accrued compensation, Weighted Average per Share			$ 0.85	$ 1.06

X

- Definition

Number of stock (or other type of equity) issued during the period as a result of any payment accrued compensation.

+ References

No definition available.

+ Details

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Namespace Prefix:	clir_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Value of stock (or other type of equity) issued during the period as a result of any payment of accrued compensation.

+ References

No definition available.

+ Details

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Namespace Prefix:	clir_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the weighted average share price for stock issued during the period for payments in accrued compensation.

+ References

No definition available.

+ Details

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Namespace Prefix:	clir_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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