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Share-Based Compensation - Restricted Stock Units Awards - Activity (Details) - Restricted Stock Unit Awards - $ / shares
shares in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Restricted Stock Units Awards (Units)    
Outstanding at beginning of period (in shares) 1,076 559
Granted (in shares) 528 557
Released (in shares) (238) (183)
Forfeited (in shares) (53) (32)
Outstanding at end of period (in shares) 1,313 901
Weighted Average Grant-Date Fair Value (in dollars per share)    
Outstanding at the beginning of period (in dollars per share) $ 7.41 $ 16.92
Granted (in dollars per share) 10.07 3.77
Released (in dollars per share) 10.98 18.44
Forfeited (in dollars per share) 8.90 9.87
Outstanding at end of period (in dollars per share) $ 7.75 $ 8.72