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Stock-Based Compensation - Schedule of Fair Value of Employee Stock Options (Details)
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Options to Purchase Common Stock    
Share-based Compensation    
Expected volatility, Minimum 51.90% 47.20%
Expected volatility, Maximum 53.10% 59.30%
Risk-free interest rate, Minimum 2.60% 2.00%
Risk-free interest rate, Maximum 2.90% 2.10%
Minimum | Options to Purchase Common Stock    
Share-based Compensation    
Expected term (in years) 5 years 8 months 12 days 5 years 9 months 18 days
Maximum | Options to Purchase Common Stock    
Share-based Compensation    
Expected term (in years) 6 years 1 month 6 days 6 years 1 month 6 days
2016 Employee Stock Purchase Plan    
Share-based Compensation    
Expected volatility, Minimum 59.50%  
Expected volatility, Maximum 87.80%  
Expected volatility   49.50%
Risk-free interest rate, Minimum 0.90%  
Risk-free interest rate, Maximum 2.10%  
Risk-free interest rate   0.50%
Expected term (in years)   6 months
2016 Employee Stock Purchase Plan | Minimum    
Share-based Compensation    
Expected term (in years) 6 months  
2016 Employee Stock Purchase Plan | Maximum    
Share-based Compensation    
Expected term (in years) 1 year