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Stock-Based Compensation - Additional Information (Details) - USD ($)
$ 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]        
Options granted (in shares) 0 0    
Options        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Unamortized compensation cost, net of expected forfeitures $ 600   $ 600  
Weighted average expected period over which the expense is to be recognized     1 year 9 months 18 days  
Tax benefits associated with exercise of stock options 0 $ 0 $ 0 $ 0
Dividend yield (as a percent)     0.00% 0.00%
Stock options exercised     0 0
RSU's        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Weighted average expected period over which the expense is to be recognized     6 months  
Unamortized compensation cost, net of expected forfeitures 300   $ 300  
RSU's | Equity Incentive Plan2010 [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Total intrinsic value of the restricted stock units outstanding $ 200   $ 200  
RSU's | Minimum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock-based compensation expense, recognition period     3 years  
RSU's | Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock-based compensation expense, recognition period     5 years