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Stock-Based Plans - Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2019
Number of Options      
Beginning balance (in shares) 2,385    
Options granted (in shares) 50    
Options exercised (in shares) (185)    
Option forfeited (in shares) (164)    
Ending balance (in shares) 2,086 2,385  
Vested (in shares) 1,264    
Expected (in shares) 822    
Weighted-Average Exercise Price per Option      
Beginning balance (in dollars per share) $ 7.69 $ 7.56 $ 7.69
Options granted (in dollars per share) 13.08    
Options exercised (in dollars per share) 5.73    
Option forfeited (in dollars per share) 9.56    
Ending balance (in dollars per share) $ 7.69 $ 7.56  
Vested (in dollars per share)     8.71
Expected (in dollars per share)     $ 6.13
Weighted- Average Remaining Contractual Life (in Years)      
Contractual life 7 years 1 month 6 days 7 years 9 months 18 days  
Vested as of September 30, 2019 6 years 4 months 24 days    
Expected to vest as of September 30, 2019 8 years 2 months 12 days    
Aggregate Intrinsic Value      
Balance as of December 31, 2018 $ 5,991    
Options exercised 1,147    
Balance as of September 30, 2019 $ 244 $ 5,991  
Vested as of September 30, 2019     $ 190
Expected to vest as of September 30, 2019     $ 54