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Employee Benefit Plans and Stock-Based Compensation - Options (Details) - Options - USD ($)
$ / shares in Units, shares in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Number of Options Outstanding [Roll Forward]        
Options outstanding, beginning of period (in shares) 2,666 3,294 3,779  
Granted (in shares) 246 184 624  
Exercised (in shares) (238) (762) (555)  
Canceled and expired (in shares) (20) (50) (554)  
Options outstanding, end of period (in shares) 2,654 2,666 3,294 3,779
Options vested and unvested options expected to vest, net of forfeitures, end of period (in shares) 2,626      
Options exercisable, end of period (in shares) 1,863      
Weighted-average Exercise Price [Roll Forward]        
Options outstanding, beginning of period (in dollars per share) $ 3.81 $ 3.38 $ 2.97  
Granted (in dollars per share) 5.77 8.99 4.92  
Exercised (in dollars per share) 2.64 3.25 2.41  
Canceled and expired (in dollars per share) 4.40 3.47 3.26  
Options outstanding, end of period (in dollars per share) 4.09 3.81 3.38 $ 2.97
Options vested and unvested options expected to vest, net of forfeitures (in dollars per share) 4.07      
Options exercisable, end of period (in dollars per share) 3.60      
Weighted-average grant date fair value of stock options granted (in dollars per share) $ 2.74 $ 3.67 $ 1.85  
Weighted average Remaining Contractual Life [Abstract]        
Options outstanding 6 years 3 months 11 days   7 years 2 months 23 days 6 years 3 months 4 days
Options vested and unvested options expected to vest, net of forfeitures, end of period 6 years 3 months      
Option exercisable, end of period 5 years 4 months 28 days 6 years 10 months 13 days    
Aggregate Intrinsic Value [Abstract]        
Options outstanding, beginning of period $ 13,149,000 $ 5,301,000 $ 764,000  
Exercised 666,000 4,030,000 1,302,000  
Options outstanding, end of period 2,720,000 $ 13,149,000 $ 5,301,000 $ 764,000
Options vested and expected to vest, end of period 2,718,000      
Options exercisable, end of period $ 2,314,000