XML 53 R42.htm IDEA: XBRL DOCUMENT v3.20.2
Stock-Based Compensation - Restricted Stock (Details) - Restricted stock awards - $ / shares
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Awards    
Unvested balance, beginning of period (in shares) 4,838,996  
Granted (in shares) 9,657,211  
Vested (in shares) (1,847,059)  
Forfeited (in shares) (861,992)  
Unvested balance, end of period (in shares) 11,787,156  
Weighted Average Grant-Date Fair Value    
Beginning of period (in dollars per share) $ 8.51  
Granted (in dollars per share) 1.10 $ 6.70
Vested (in dollars per share) 8.69  
Forfeited (in dollar per share) 5.79  
End of period (in dollars per share) $ 2.45