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Share-based Compensation - Activity (Details)
6 Months Ended
Jun. 30, 2020
shares
Stock Options  
Outstanding — beginning balance 9,044,304
Granted 1,209,500
Exercised (442,193)
Canceled (314,967)
Outstanding — ending balance 9,496,644
Exercisable — ending balance 3,990,056
RSUs  
Restricted Stock Units  
Non-vested — beginning balance 400,315
Granted 315,137
Vested (465,269)
Forfeited (1,250)
Non-vested — ending balance 248,933