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Restricted Stock Units - Allocation and Narrative (Details) - USD ($)
shares in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Tax benefit recognized $ 0 $ 0  
Compensation cost capitalized as part of the cost of an asset $ 0 0  
Vested restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Unvested restricted stock units (in shares) 2,938   3,196
Stock-based compensation expense $ 130,000 98,000  
Unrecognized stock-based compensation expense, other than options $ 1,390,000    
Time-based Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Unvested restricted stock units (in shares) 1,191    
Unrecognized stock-based compensation expense, other than options $ 352,000    
Weighted average period for amortization of unrecognized stock-based compensation 8 months 19 days    
Performance-based Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Unvested restricted stock units (in shares) 1,747    
Unrecognized stock-based compensation expense, other than options $ 1,038,000    
Cost of revenue | Vested restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Stock-based compensation expense 12,000 8,000  
Research and development | Vested restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Stock-based compensation expense 14,000 9,000  
Sales and marketing | Vested restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Stock-based compensation expense 4,000 4,000  
General and administrative | Vested restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Stock-based compensation expense $ 100,000 $ 77,000  
Non-Employee Director | Vested restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Vested restricted stock units, remaining outstanding (in shares) 517