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Accrued Liabilities Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Other Commitments [Line Items]    
Accrued Liabilities, Current $ 2,694us-gaap_AccruedLiabilitiesCurrent $ 1,761us-gaap_AccruedLiabilitiesCurrent
Other Current Liabilities [Member]    
Other Commitments [Line Items]    
Accrued Liabilities, Current 340us-gaap_AccruedLiabilitiesCurrent
/ us-gaap_OtherCommitmentsAxis
= us-gaap_OtherCurrentLiabilitiesMember
783us-gaap_AccruedLiabilitiesCurrent
/ us-gaap_OtherCommitmentsAxis
= us-gaap_OtherCurrentLiabilitiesMember
Dividend Declared [Member]    
Other Commitments [Line Items]    
Accrued Liabilities, Current 914us-gaap_AccruedLiabilitiesCurrent
/ us-gaap_OtherCommitmentsAxis
= us-gaap_DividendDeclaredMember
0us-gaap_AccruedLiabilitiesCurrent
/ us-gaap_OtherCommitmentsAxis
= us-gaap_DividendDeclaredMember
Marketing Incentive [Member]    
Other Commitments [Line Items]    
Accrued Liabilities, Current 642us-gaap_AccruedLiabilitiesCurrent
/ us-gaap_OtherCommitmentsAxis
= clro_MarketingIncentiveMember
301us-gaap_AccruedLiabilitiesCurrent
/ us-gaap_OtherCommitmentsAxis
= clro_MarketingIncentiveMember
Warranty Obligations [Member]    
Other Commitments [Line Items]    
Accrued Liabilities, Current 331us-gaap_AccruedLiabilitiesCurrent
/ us-gaap_OtherCommitmentsAxis
= us-gaap_WarrantyObligationsMember
338us-gaap_AccruedLiabilitiesCurrent
/ us-gaap_OtherCommitmentsAxis
= us-gaap_WarrantyObligationsMember
Other Liabilities [Member]    
Other Commitments [Line Items]    
Accrued Liabilities, Current $ 467us-gaap_AccruedLiabilitiesCurrent
/ us-gaap_OtherCommitmentsAxis
= us-gaap_OtherLiabilitiesMember
$ 339us-gaap_AccruedLiabilitiesCurrent
/ us-gaap_OtherCommitmentsAxis
= us-gaap_OtherLiabilitiesMember