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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Number of shares available for grant (in shares) 404,941    
Compensation not yet recognized $ 893    
Period for recognition (in years) 2 years 9 months    
Vesting period (in years) 10 years    
Requisite service period (in years) 4 years    
Weighted-average fair value of options granted during the year (in dollars per share) $ 0.68 $ 1.11 $ 1.54
Vested (in shares) 981,633 381,916  
Vested (in dollars per share) $ 2,794 $ 1,667  
Total stock-based compensation expense $ 1,389 1,991 $ 1,809
Share Price (in dollars per share) $ 1.12    
Second Anniversary of Award Date      
Percent of options vesting 50.00%    
Third Anniversary of Award Date      
Percent of options vesting 25.00%    
Fourth Anniversary of Award Date      
Percent of options vesting 25.00%    
Minimum      
Vesting period (in years) 2 years    
Maximum      
Vesting period (in years) 4 years    
Non-Vested Stock Options      
Compensation not yet recognized $ 0    
Weighted-average fair value of options granted during the year (in dollars per share) $ 0.68    
The First Type of Restriced Stock Units      
Vesting period (in years) 3 years    
The Second Type of Restricted Stock Units      
Vesting period (in years) 2 years    
The Second Type of Restricted Stock Units | Second Anniversary of Award Date      
Percent of options vesting 67.00%    
The Second Type of Restricted Stock Units | Third Anniversary of Award Date      
Percent of options vesting 33.00%    
The Third Type of Restricted Stock Units      
Vesting period (in years) 2 years    
The Third Type of Restricted Stock Units | Second Anniversary of Award Date      
Percent of options vesting 67.00%    
The Third Type of Restricted Stock Units | Third Anniversary of Award Date      
Percent of options vesting 33.00%    
Restricted Stock Units (RSUs)      
Total stock-based compensation expense $ 1,269 $ 1,901 $ 1,615
Reserved For Issuance Upon Exercise Or Vesting Of Equity Awards      
Number of shares reserved for future issuance 4,400,676