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Employee Benefit Plan (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Employee Benefits    
Employee benefit plan, Company's portion vested at time of match (as a percent) 100.00%  
Employee benefit plan expense $ 1,235 $ 1,236
Participant's first 3% of deferrals    
Employee Benefits    
Employee benefit plan, Company match (as a percent) 100.00%  
Participant's second 2% of deferrals    
Employee Benefits    
Employee benefit plan, Company match (as a percent) 50.00%