Preferred Stock (Series D Convertible Preferred Stock) (Narrative) (Details) - shares	Feb. 28, 2017	Sep. 30, 2017	Dec. 31, 2016	Mar. 16, 2016
Series D Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares outstanding			6,245,156	6,245,156
Series E Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares outstanding	925,000	925,000
Redeemable preferred stock, shares issued	925,000
Common Stock [Member]
Class of Stock [Line Items]
Shares issued upon conversion	6,004,957