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Equity - Warrants - Exercise price and average life (Details)	3 Months Ended
	Mar. 31, 2021 USD ($) $ / shares shares
Warrants
Intrinsic value of warrants (in dollars) | $	$ 42,500
Exercise Price 1.80 [Member]
Warrants
Warrants Exercise Price (in dollars per share) | $ / shares	$ 1.80
Warrants Outstanding (in shares) | shares	37,500

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

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: