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Stockholder's Deficit - Stock Option Plan - Additional Information (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
2008 Plan    
Class Of Stock [Line Items]    
Common stock options available for grant under stock option plan 28,548,101 22,744,090
Percentage Of Voting Rights 10.00%  
Stock option vesting period 4 years  
Stock option term 10 years  
2008 Plan | Minimum | 10% Shareholder    
Class Of Stock [Line Items]    
Stock option fair market value at the date of grant, percent 110.00%  
Equity Incentive Plan    
Class Of Stock [Line Items]    
Shares vested and exercisable, Aggregate intrinsic value $ 354,849,000