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Property and Equipment, Net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property and Equipment, Net      
Total $ 20,938 $ 16,810  
Less: accumulated depreciation (11,282) (6,716)  
Total property and equipment, net of accumulated depreciation 9,656 10,094  
Depreciation expense related to property and equipment 4,649 3,404 $ 1,840
Disposal of assets during the period, cost 107    
Disposal of assets during the period, accumulated depreciation 84    
Impairment of property and equipment   566  
Former corporate headquarters      
Property and Equipment, Net      
Impairment of property and equipment   566  
Disposal cost   22  
Change in Accounting Method Accounted for as Change in Estimate [Member] | Former corporate headquarters      
Property and Equipment, Net      
Total   (2,251)  
Less: accumulated depreciation   1,707  
Leasehold improvements      
Property and Equipment, Net      
Total 8,524 6,863  
Computer hardware      
Property and Equipment, Net      
Total 8,909 6,774  
Capital lease obligations 1,141    
Capital lease, depreciation 0    
Furniture and fixtures      
Property and Equipment, Net      
Total 1,708 1,636  
Computer software      
Property and Equipment, Net      
Total 1,571 1,344  
Office equipment      
Property and Equipment, Net      
Total $ 226 $ 193