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Stock-Based Compensation - Schedule of Options Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Weighted Average Remaining Life (in years)      
Weighted Average Remaining Life (in years) 2 years 4 months 24 days    
Communicated Option Awards [Member]      
Options outstanding      
Beginning balance 933,500 654,500  
Granted 170,000 394,000  
Forfeited (67,000) (115,000)  
Cancelled and settled with Replacement Awards (1,036,500)    
Ending balance 0 933,500 654,500
Exercisable at December 31, 2018 0    
Vested and expected to vest at December 31, 2018 0    
Weighted Average Exercise Price      
Beginning balance $ 3.92 $ 2.22  
Granted 25.00 7.35  
Forfeited 5.33 6.00  
Cancelled and settled with Replacement Awards 7.29    
Ending balance 0 $ 3.92 $ 2.22
Exercisable at December 31, 2018 0    
Vested and expected to vest at December 31, 2018 $ 0    
Weighted Average Remaining Life (in years)      
Weighted Average Remaining Life (in years)   4 years 10 months 9 days 5 years 18 days
Granted   6 years 7 days  
Exercisable at December 31, 2018 $ 0    
Vested and expected to vest at December 31, 2018 0    
Aggregate Intrinsic Value      
Balance 19,676 $ 3,781  
Cancelled and settled with Replacement Awards 22,442    
Balance 0 $ 19,676 $ 3,781
Exercisable at December 31, 2018 0    
Vested and expected to vest at December 31, 2018 $ 0    
Stock Options [Member]      
Options outstanding      
Granted 1,945,900    
Forfeited (25,800)    
Ending balance 1,920,100    
Exercisable at December 31, 2018 80,499    
Vested and expected to vest at December 31, 2018 1,920,100    
Weighted Average Exercise Price      
Granted $ 28.47    
Forfeited 19.27    
Ending balance 28.59    
Exercisable at December 31, 2018 28.94    
Vested and expected to vest at December 31, 2018 $ 28.94    
Weighted Average Remaining Life (in years)      
Weighted Average Remaining Life (in years) 9 years 5 months 4 days    
Granted 9 years 5 months 4 days    
Vested and expected to vest at December 31, 2018 9 years 5 months 4 days