Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Schedule of Options Activity (Details)

v3.19.3
Stock-Based Compensation - Schedule of Options Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Weighted Average Remaining Life (in years)        
Weighted Average Remaining Life (in years) 1 year 10 months 24 days      
Communicated Option Awards [Member]        
Options outstanding        
Beginning balance   933,500 933,500  
Granted   170,000    
Forfeited   (67,000)    
Cancelled and settled with Replacement Awards   (1,036,500)    
Ending balance       933,500
Weighted Average Exercise Price        
Beginning balance   $ 3.92 $ 3.92  
Granted   25.00    
Forfeited   5.33    
Cancelled and settled with Replacement Awards   $ 7.29    
Ending balance       $ 3.92
Weighted Average Remaining Life (in years)        
Weighted Average Remaining Life (in years)       3 years 6 months 25 days
Aggregate Intrinsic Value        
Balance   $ 19,676 $ 19,676  
Cancelled and settled with Replacement Awards   $ 22,442    
Balance       $ 19,676
Stock Options [Member]        
Options outstanding        
Beginning balance 1,920,100      
Forfeited (27,900)      
Ending balance 1,892,200   1,920,100  
Exercisable at the end of the period 686,212      
Vested and expected to vest at the end of the period 1,892,200      
Weighted Average Exercise Price        
Beginning balance $ 28.59      
Forfeited 14.03      
Ending balance 28.81   $ 28.59  
Exercisable at the end of the period 28.94      
Vested and expected to vest at the end of the period $ 28.81      
Weighted Average Remaining Life (in years)        
Weighted Average Remaining Life (in years) 8 years 11 months 4 days   9 years 5 months 4 days  
Exercisable at the end of the period 8 years 11 months 4 days      
Vested and expected to vest at the end of the period 8 years 11 months 4 days