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Stock-Based Compensation - Restricted Stock Awards (Details) - Restricted Stock [Member] - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 08, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock issued 26,000        
Fair value per share of restricted stock awards (in dollars per share) $ 4.00        
Award vesting period (in years)       3 years  
Share-based compensation expense   $ 401 $ 399 $ 704 $ 733
Reduction in share-based compensation expense   2   143  
Unrecognized compensation expense   $ 3,273   $ 3,273  
Unrecognized compensation expense, weighted-average period of recognition (in years)       2 years 2 months 16 days  
First Anniversary [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights, percentage       33.33%  
Second Anniversary [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights, percentage       33.33%  
Third Anniversary [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights, percentage       33.33%