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Stock-Based Compensation - Restriced Stock Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Unrecognized stock-based compensation cost $ 8.7    
Unrecognized stock-based compensation cost, weighted-average period recognized 1 year 7 months 6 days    
Restricted stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock award vesting period 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]      
Shares outstanding, beginning balance (in shares) 2,184,675 1,541,648 2,155,845
Granted (in shares) 1,676,634 1,586,590 1,000,690
Vested (in shares) (928,778) (797,025) (1,277,076)
Canceled/Forfeited (in shares) (207,807) (146,538) (337,811)
Shares outstanding ending balance (in shares) 2,724,724 2,184,675 1,541,648
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Shares outstanding, Weighted Average Grant Date Fair Value, beginning balance (in dollars per share) $ 5.89 $ 7.14 $ 5.72
Canceled/Forfeited (in dollars per share) 5.36 5.70 6.51
Grant date fair value of restricted stock 5.13 4.90 7.63
Vested (in dollars per share) 6.46 6.36 5.30
Shares outstanding, Weighted Average Grant Date Fair Value, ending balance (in dollars per share) $ 5.26 $ 5.89 $ 7.14
Unrecognized stock-based compensation cost $ 4.4    
Unrecognized stock-based compensation cost, weighted-average period recognized 1 year 4 months 24 days