Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Assumptions (Details)

v3.6.0.2
Stockholders' Equity - Assumptions (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate (percent)     1.90%
Expected term   6 years 6 months 6 years
Forfeiture rate (percent) 5.00% 8.52%  
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate (percent) 1.30% 1.70%  
Expected volatility (percent) 48.00% 50.00% 62.00%
Expected term 6 years 7 months 6 days    
Forfeiture rate (percent)     8.60%
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate (percent) 1.90% 2.00%  
Expected volatility (percent) 50.00% 58.00% 69.00%
Expected term 6 years 8 months 12 days    
Forfeiture rate (percent)     9.70%