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Stock-Based Compensation - General Information (Details)
1 Months Ended 12 Months Ended
Mar. 20, 2017
shares
Feb. 10, 2016
shares
Mar. 31, 2017
shares
Aug. 31, 2016
shares
Dec. 31, 2017
Option
shares
Dec. 31, 2016
shares
2014 Stock Plan            
Stock-Based Compensation            
Number of shares available for grant (in shares)   0        
2016 Equity Incentive Plan            
Stock-Based Compensation            
Number of shares available for grant (in shares)         2,204,082  
Number of incentive stock options that may be granted after the 10th anniversary of the effective date of the plan | Option         0  
Common stock that may be issued pursuant to stock awards (in shares)   4,339,451        
Common stock that may be issued pursuant to stock awards, new shares (in shares)   2,400,000        
Annual automatic increase percentage (as a percent)   4.00%        
Vesting period (in years)         10 years  
Expiration period (in years)         10 years  
Maximum | 2016 Equity Incentive Plan            
Stock-Based Compensation            
Vesting period (in years)         4 years  
Employee Stock Options | 2016 Equity Incentive Plan            
Stock-Based Compensation            
Common stock that may be issued pursuant to stock awards (in shares)   8,678,902        
Service Based RSUs            
Stock-Based Compensation            
Shares granted (in shares)         2,000  
Vesting period (in years)         3 years  
Service Based RSUs | 2016 Equity Incentive Plan            
Stock-Based Compensation            
Shares granted (in shares)       57,500    
Performance Based RSU            
Stock-Based Compensation            
Shares granted (in shares) 49,332,000         0
Performance Based RSU | 2016 Equity Incentive Plan            
Stock-Based Compensation            
Shares granted (in shares)     49,332