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Stockholders' (Deficit) Equity (Series E Convertible Preferred Stock) (Details) - $ / shares
Sep. 30, 2016
Jul. 07, 2016
Class of Stock [Line Items]    
Redemption price (in dollars per share)   $ 5.20
Series E Preferred Stock    
Class of Stock [Line Items]    
Preferred stock, shares authorized (in shares)   10,000
Preferred stock, par value (in dollars per share)   $ 1,000
Preferred stock, shares outstanding (in shares) 4,435