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Stock-based Compensation - Award Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of Shares      
Forfeited/expired (shares)   (27) (305)
Weighted-average Grant Date Fair Value per Share      
Forfeited/Expired, weighted average exercise price per share (usd per share)   $ 3.65 $ 2.82
Exercisable and Expected to Vest      
Options exercisable (shares) 2,876    
Options vested and expected to vest (shares) 3,954    
Options exercisable (usd per share) $ 3.83    
Options vested and expected to vest (usd per share) $ 4.69    
Weighted average remaining contractual terms, exercisable options 5 years 3 months    
Weighted average remaining contractual terms, vested and expected to vest options 6 years 1 month 17 days    
Aggregate intrinsic value, exercisable options $ 37,005    
Aggregate intrinsic value, options vested and expected to vest $ 47,503    
RSAs      
Number of Shares      
Non-vested, beginning of period (shares) 159 230 480
Granted (shares) 47 143 185
Vested (shares) (151) (214) (435)
Non-vested, end of period (shares) 55 159 230
Weighted-average Grant Date Fair Value per Share      
Non-vested, beginning of period (usd per share) $ 4.68 $ 3.82 $ 3.29
Granted, weighted average grant date fair value (usd per share) 14.35 4.75 4.21
Vested, weighted average grant date fair value (usd per share) 4.71 3.81 3.40
Non-vested, end of period (usd per share) $ 12.83 $ 4.68 $ 3.82
RSUs      
Number of Shares      
Non-vested, beginning of period (shares) 560 617 545
Granted (shares) 86 275 330
Vested (shares) (290) (302) (243)
Forfeited/expired (shares) (8) (30) (15)
Non-vested, end of period (shares) 348 560 617
Weighted-average Grant Date Fair Value per Share      
Non-vested, beginning of period (usd per share) $ 4.08 $ 3.69 $ 3.15
Granted, weighted average grant date fair value (usd per share) 10.56 4.22 4.10
Vested, weighted average grant date fair value (usd per share) 4.09 3.40 3.11
Forfeited/Expired, weighted average exercise price per share (usd per share) 4.73 4.12 2.74
Non-vested, end of period (usd per share) $ 5.66 $ 4.08 $ 3.69
PSUs      
Number of Shares      
Non-vested, beginning of period (shares) 429 831 989
Granted (shares) 306 276 629
Vested (shares) (495) (651) (482)
Non-vested, end of period (shares) 240 429 831
Weighted-average Grant Date Fair Value per Share      
Non-vested, beginning of period (usd per share) $ 4.20 $ 3.88 $ 2.94
Granted, weighted average grant date fair value (usd per share) 6.71 4.25 4.10
Vested, weighted average grant date fair value (usd per share) 4.16 3.84 2.89
Non-vested, end of period (usd per share) $ 7.48 $ 4.20 $ 3.88
PBOs      
Number of Shares      
Non-vested, beginning of period (shares) 1,720 0  
Granted (shares) 1,200 1,720  
Exercised (shares) (84)    
Forfeited/expired (shares) (1,254)    
Non-vested, end of period (shares) 1,582 1,720 0
Weighted-average Grant Date Fair Value per Share      
Non-vested, beginning of period (usd per share) $ 2.54 $ 0.00  
Granted, weighted average grant date fair value (usd per share) 5.02 2.54  
Exercised, weighted average grant date fair value (usd per share) 2.54    
Forfeited/Expired, weighted average exercise price per share (usd per share) 3.73    
Non-vested, end of period (usd per share) $ 3.47 $ 2.54 $ 0.00
Exercisable and Expected to Vest      
Options exercisable (shares) 493    
Options vested and expected to vest (shares) 1,582    
Options exercisable (usd per share) $ 4.60    
Options vested and expected to vest (usd per share) $ 6.24    
Weighted average remaining contractual terms, exercisable options 5 years 7 months 7 days    
Weighted average remaining contractual terms, vested and expected to vest options 5 years 5 months 8 days    
Aggregate intrinsic value, exercisable options $ 5,968    
Aggregate intrinsic value, options vested and expected to vest $ 16,553