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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 1,500 $ 1,100 $ 4,493 $ 2,198
Stock options granted     554,000  
Performance-based restricted stock units granted     673,000  
Time-vesting restricted stock units granted     490,000  
Expected volatility rate, minimum     44.97%  
Expected volatility rate, maximum     56.01%  
Risk free interest rate, minimum     2.07%  
Risk free interest rate, maximum     2.78%  
Expected dividend yield     0.00%  
Expected life, minimum     3 years 6 months  
Expected life, maximum     5 years 9 months  
Weighted average exercise price of options granted     $ 9.06  
Weighted average grant date fair value of options granted     3.97  
Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average grant date fair value of restricted stock units granted     8.58  
Performance-based restricted stock units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average grant date fair value of restricted stock units granted     $ 9.03