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Fair Value Measurements (Company's Financial Instruments Carried at Fair Value Using Lowest Level of Input) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Assets:    
Money market funds $ 9,574bcov_MoneyMaketFundsFairValueDisclosure $ 13,797bcov_MoneyMaketFundsFairValueDisclosure
Restricted cash 201bcov_RestrictedCashFairValueDisclosure 322bcov_RestrictedCashFairValueDisclosure
Total assets 9,775us-gaap_AssetsFairValueDisclosure 14,119us-gaap_AssetsFairValueDisclosure
Quoted Prices in Active Markets for Identical Items (Level 1) [Member]    
Assets:    
Money market funds 9,574bcov_MoneyMaketFundsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 13,797bcov_MoneyMaketFundsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Restricted cash      
Total assets 9,574us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 13,797us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Significant Other Observable Inputs (Level 2) [Member]    
Assets:    
Money market funds      
Restricted cash 201bcov_RestrictedCashFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 322bcov_RestrictedCashFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Total assets 201us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 322us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Significant Unobservable Inputs (Level 3) [Member]    
Assets:    
Money market funds      
Restricted cash      
Total assets