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Business Combination, Goodwill and Intangibles - Intangibles (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]      
Total finite and indefinite-lived intangible assets, gross $ 11,070clro_FiniteAndIndefiniteLivedIntangibleAssetsGross   $ 11,070clro_FiniteAndIndefiniteLivedIntangibleAssetsGross
Accumulated amortization (3,489)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization   (3,174)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Intangible assets, net (excluding goodwill) 7,581us-gaap_IntangibleAssetsNetExcludingGoodwill   7,896us-gaap_IntangibleAssetsNetExcludingGoodwill
Amortization of Intangible Assets 315us-gaap_AmortizationOfIntangibleAssets 169us-gaap_AmortizationOfIntangibleAssets  
Tradename      
Goodwill and Intangible Assets Disclosure [Abstract]      
Finite-lived intangible assets, useful life (in years) 7 years    
Finite-lived intangible assets, gross 555us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
  555us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
Patents and technological know-how      
Goodwill and Intangible Assets Disclosure [Abstract]      
Finite-lived intangible assets, gross 5,850us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= clro_PatentsAndTechnologyMember
  5,850us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= clro_PatentsAndTechnologyMember
Proprietary Software [Member]      
Goodwill and Intangible Assets Disclosure [Abstract]      
Finite-lived intangible assets, gross 4,341us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= clro_ProprietarySoftwareMember
  4,341us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= clro_ProprietarySoftwareMember
Other      
Goodwill and Intangible Assets Disclosure [Abstract]      
Finite-lived intangible assets, useful life (in years) 5 years    
Finite-lived intangible assets, gross $ 324us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherCreditDerivativesMember
  $ 324us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherCreditDerivativesMember
Minimum [Member] | Computer Software, Intangible Asset [Member]      
Goodwill and Intangible Assets Disclosure [Abstract]      
Finite-lived intangible assets, useful life (in years) 3 years    
Minimum [Member] | Tradename      
Goodwill and Intangible Assets Disclosure [Abstract]      
Finite-lived intangible assets, useful life (in years) 5 years    
Maximum [Member] | Computer Software, Intangible Asset [Member]      
Goodwill and Intangible Assets Disclosure [Abstract]      
Finite-lived intangible assets, useful life (in years) 15 years