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Stock-based Compensation - Stock Option Activity (Details) - Service Based Stock Options - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Shares      
Beginning balance (in shares) 7,399,217    
Granted (in shares) 1,146,258 1,686,800  
Exercised (in shares) 0    
Expired (in shares) 0    
Forfeited (in shares) (172,435)    
Ending balance (in shares) 8,373,040   7,399,217
Exercisable (in shares) 4,844,852    
Vested and expected to vest (in shares) 8,373,040    
Weighted average exercise price per share      
Beginning balance (usd per share) $ 9.81    
Granted (usd per share) 5.65    
Exercised (usd per share) 0    
Expired (usd per share) 0    
Forfeited (usd per share) 10.57    
Ending balance (usd per share) 9.22   $ 9.81
Exercisable (usd per share) 9.41    
Vested and expected to vest (usd per share) $ 9.22    
Weighted average remaining contractual life      
Options outstanding, Weighted average remaining contractual life 6 years 7 months 2 days   6 years 4 months 13 days
Options exercisable, Weighted average remaining contractual life 4 years 10 months 24 days    
Vested and expected to vest, Weighted average remaining contractual life 6 years 7 months 2 days