Annual report pursuant to Section 13 and 15(d)

Stock-based Compensation - Award Activity (Details)

v3.20.4
Stock-based Compensation - Award Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Exercisable and Expected to Vest      
Options exercisable (shares) 2,569    
Options vested and expected to vest (shares) 3,279    
Options exercisable (usd per share) $ 5.09    
Options vested and expected to vest (usd per share) $ 6.96    
Weighted average remaining contractual terms, exercisable options 4 years 3 months 18 days    
Weighted average remaining contractual terms, vested and expected to vest options 5 years 3 months 18 days    
Aggregate intrinsic value, exercisable options $ 42,998    
Aggregate intrinsic value, options vested and expected to vest $ 48,786    
RSAs      
Number of Shares      
Non-vested, beginning of period (shares) 35 55 159
Granted (shares) 96 40 47
Vested (shares) (35) (56) (151)
Forfeited/expired (shares)   (4)  
Non-vested, end of period (shares) 96 35 55
Weighted-average Grant Date Fair Value per Share      
Non-vested, beginning of period (usd per share) $ 17.18 $ 12.83 $ 4.68
Granted, weighted average grant date fair value (usd per share) 11.44 17.18 14.35
Vested, weighted average grant date fair value (usd per share) 17.18 12.83 4.71
Forfeited/Expired, weighted average exercise price per share (usd per share)   17.18  
Non-vested, end of period (usd per share) $ 11.44 $ 17.18 $ 12.83
RSUs      
Number of Shares      
Non-vested, beginning of period (shares) 201 348 560
Granted (shares) 156 72 86
Vested (shares) (168) (210) (290)
Forfeited/expired (shares) (13) (9) (8)
Non-vested, end of period (shares) 176 201 348
Weighted-average Grant Date Fair Value per Share      
Non-vested, beginning of period (usd per share) $ 10.76 $ 5.66 $ 4.08
Granted, weighted average grant date fair value (usd per share) 14.22 19.19 10.56
Vested, weighted average grant date fair value (usd per share) 10.05 5.03 4.09
Forfeited/Expired, weighted average exercise price per share (usd per share) 15.16 13.60 4.73
Non-vested, end of period (usd per share) $ 14.17 $ 10.76 $ 5.66
PSUs      
Number of Shares      
Non-vested, beginning of period (shares) 120 240 429
Granted (shares) 124 95 306
Vested (shares) (107) (200) (495)
Forfeited/expired (shares) (6) (15)  
Non-vested, end of period (shares) 131 120 240
Weighted-average Grant Date Fair Value per Share      
Non-vested, beginning of period (usd per share) $ 13.88 $ 7.48 $ 4.20
Granted, weighted average grant date fair value (usd per share) 13.59 14.98 6.71
Vested, weighted average grant date fair value (usd per share) 11.28 6.58 7.16
Forfeited/Expired, weighted average exercise price per share (usd per share) 21.80 15.58  
Non-vested, end of period (usd per share) $ 15.34 $ 13.88 $ 7.48
PBOs      
Number of Shares      
Non-vested, beginning of period (shares) 1,260 1,582 1,720
Granted (shares) 689 718 1,200
Exercised (shares)   (422) (84)
Forfeited/expired (shares) (389) (618) (1,254)
Non-vested, end of period (shares) 1,560 1,260 1,582
Weighted-average Grant Date Fair Value per Share      
Non-vested, beginning of period (usd per share) $ 4.75 $ 3.47 $ 2.54
Granted, weighted average grant date fair value (usd per share) 6.37 11.44 5.02
Exercised, weighted average grant date fair value (usd per share)   3.17 2.54
Forfeited/Expired, weighted average exercise price per share (usd per share) 6.42 10.34 3.73
Non-vested, end of period (usd per share) $ 5.05 $ 4.75 $ 3.47
Exercisable and Expected to Vest      
Options exercisable (shares) 1,156    
Options vested and expected to vest (shares) 1,510    
Options exercisable (usd per share) $ 7.55    
Options vested and expected to vest (usd per share) $ 9.54    
Weighted average remaining contractual terms, exercisable options 6 years 7 months 6 days    
Weighted average remaining contractual terms, vested and expected to vest options 7 years 2 months 12 days    
Aggregate intrinsic value, exercisable options $ 16,504    
Aggregate intrinsic value, options vested and expected to vest $ 18,567