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Business Description, Basis of Presentation and Significant Accounting Policies - Deferred Revenue and Associated Costs of Goods Sold and Gross Profit (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Business Description, Basis of Presentation and Significant Accounting Policies |  |
Deferred revenue | $ 123 | $ 173
Deferred cost of goods sold |  |
Deferred gross profit | $ 123 | $ 173

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- Definition Amount of deferred cost of goods sold as of balance sheet date. + References No definition available. + Details
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Namespace Prefix: | clro_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of deferred gross profit as of balance sheet date. + References No definition available. + Details
Name: | clro_DeferredGrossProfit
Namespace Prefix: | clro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(5)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DeferredRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration