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Commitments and Contigencies - Preferred Stock Dividends (Details) - USD ($)
12 Months Ended
Aug. 10, 2016
Dec. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Convertible Series A Preferred Stock        
Cumulative unpaid dividends     $ 300,000  
Series A Convertible Preferred Stock.        
Convertible Series A Preferred Stock        
Dividend rate   8.00%    
Original issue price, per share       $ 6.70585
Cumulative unpaid dividends   $ 0 $ 300,000  
Shares converted 827,205