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Stockholders' Equity (Detail Textuals) - $ / shares
 1 Months Ended 6 Months Ended
May 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Stockholders' equity      
Preferred stock, shares issued   335,273 335,273
Preferred stock, shares outstanding   335,273 335,273
Preferred stock, par value (in dollars per share)   $ 0.001 $ 0.001
Convertible Exchangeable Preferred Stock      
Stockholders' equity      
Preferred stock, shares issued   335,273  
Preferred stock, shares outstanding   335,273  
Dividend rate on convertible exchangeable preferred stock (in percent)   6.00%  
Share issue price per share   $ 10.00  
Liquidation preference (in dollars per share)   10.00  
Minimum bid price per share   $ 2,961  
Percentage of closing sales price of common stock that conversion price must exceed in order for preferred stock to be convertible   150.00%  
Number of trading days within 30 trading days in which the closing price of common stock must exceed conversion price for preferred stock to be convertible   20 days  
Number of trading days during which closing price of common stock must exceed conversion price for at least 20 days in order for the preferred stock to be convertible   30 days  
Number of trading days prior to notice of automatic conversion   5 days  
Redemption price per share (in dollars per share)   $ 10.00  
Interest rate of Convertible Subordinated Debentures (as a percent)   6.00%  
Debt principal amount per share, basis for exchange (in dollars per share)   $ 10.00  
Debt instrument, term   25 years  
Preferred stock dividend declared, amount per share $ 0.15    
Dividend paid, date Aug. 01, 2017    
Dividend, record date Jul. 14, 2017