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Stock-Based Compensation - Stock Grants (Details) - Common Stock Grants [Member] - USD ($)
3 Months Ended
Mar. 08, 2017
Feb. 01, 2017
Mar. 31, 2017
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Shares 52,000 56,940    
Price Per Share (in dollars per share) $ 4.00 $ 2.81    
Share-based compensation expense     $ 368,001.000 $ 246,000