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Related Party Transactions (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Related Party Transactions
Reimbursement Payable Included In Accounts Payable And Accrued Liabilities		$ 40,000
General and administrative
Related Party Transactions
Related Party Transaction, Expenses from Transactions with Related Party	$ 101,000	$ 364,000

X

- Definition

It represents the amount of reimbursement payable included in accounts payable and accrued liabilities.

+ References

No definition available.

+ Details

Name:	clir_ReimbursementPayableIncludedInAccountsPayableAndAccruedLiabilities
Namespace Prefix:	clir_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

Name:	us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_GeneralAndAdministrativeExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: