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Share-based Compensation - Activity (Details)
6 Months Ended
Jun. 30, 2021
shares
Stock Options  
Outstanding — beginning balance 8,479,979
Granted 1,330,000
Exercised (897,234)
Canceled (341,731)
Outstanding — ending balance 8,571,014
Exercisable — ending balance 4,596,393
RSUs  
Restricted Stock Units  
Non-vested — beginning balance 417,105
Granted 830,174
Vested (793,227)
Forfeited (34,433)
Non-vested — ending balance 419,619