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Discontinued Operations - Proceeds from and Carrying Amount of Assets from the Sale of the Services Business (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jul. 16, 2015
Sep. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jul. 21, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Consideration in escrow     $ 0 $ 500    
Less: Loss on disposal   $ 73        
Services Business | Discontinued Operations Disposed of by Sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Net cash consideration received at closing $ 2,549         $ 2,549
Consideration in escrow 500         $ 500
Total consideration 3,049          
Less: selling costs 764 $ 764   764    
Proceeds from sale, net of selling costs 2,285          
Accounts and unbilled receivables, net 1,470          
Prepaid expenses and other current assets 713          
Property and equipment, net of accumulated depreciation 4,900          
Other assets 59          
Assets of Services Business, net 7,142          
Accounts payable and accrued expenses 616          
Deferred revenue 1,657          
Deferred rent 1,161          
Liabilities related to assets of the Services Business 3,434          
Assets of the Services Business, net of liabilities 3,708          
Less: Impairment charge recognized upon classification as held for sale 1,350          
Less: Loss on disposal 73   $ 0 $ 73 $ 0  
Assets of the Services Business, net of liabilities and impairment charges $ 2,285