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Share-Based Compensation - Restricted Stock Unit Awards Outstanding (Details) - Restricted Stock Units - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Outstanding at beginning of period: (in shares) 1,076 559 443  
Granted (in shares) 528 782 339  
Released (in shares) (317) (208) (172)  
Forfeited (in shares) (79) (57) (51)  
Outstanding at end of period: (in shares) 1,208 1,076 559  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Outstanding at beginning of period: (in dollars per share) $ 7.96 $ 7.41 $ 16.92 $ 20.55
Granted (in dollars per share) 10.07 3.79 14.04  
Released (in dollars per share) 10.77 18.71 20.38  
Forfeited (in dollars per share) 8.82 9.62 17.71  
Outstanding at end of period: (in dollars per share) $ 7.96 $ 7.41 $ 16.92 $ 20.55