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Stock Options - Summary of Information About Stock Options (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options (in shares) 223,556 27,766  
Non-Qualified Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options (in shares) 223,556 27,766 37,636
Weighted Average Exercise Price (in dollars per share) $ 2.62 $ 12.47 $ 12.01
Number Exercisable (in shares) 44,827 21,187 18,665
$1.52- $13.30 | Non-Qualified Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise price range, lower limit (in dollars per share) $ 1.52    
Exercise price range, upper limit (in dollars per share) $ 13.3    
Stock options (in shares) 223,556    
Weighted Average Remaining Contractual Life (Years) 9 years 15 days    
Weighted Average Exercise Price (in dollars per share) $ 2.62    
Aggregate Intrinsic Value $ 489,475    
Number Exercisable (in shares) 44,827    
Weighted Average Exercise Price of Exercisable Options (in dollars per share) $ 13.49    
Aggregate Intrinsic Value $ 54,386    
$10.26-$38.00 | Non-Qualified Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise price range, lower limit (in dollars per share)   $ 10.26  
Exercise price range, upper limit (in dollars per share)   $ 38  
Stock options (in shares)   27,766  
Weighted Average Remaining Contractual Life (Years)   5 years 3 months  
Weighted Average Exercise Price (in dollars per share)   $ 12.47  
Aggregate Intrinsic Value   $ 0  
Number Exercisable (in shares)   21,187  
Weighted Average Exercise Price of Exercisable Options (in dollars per share)   $ 13.16  
Aggregate Intrinsic Value   $ 0