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Equity - Warrants - Exercise price and average life (Details) - Exercise Price 1.80 [Member]	3 Months Ended
	Mar. 31, 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	10 months 17 days

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

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

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

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

X

- Details

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