Fair Value of Financial Assets and Liabilities - Derivative Instruments (Valuation Assumptions for Warrants) (Details) - $ / shares		9 Months Ended	12 Months Ended
		Sep. 30, 2015	Dec. 31, 2014
2011 [Member]
Fair Value Assumptions and Methodology for Assets and Liabilities [Line Items]
Volatility	[1]	112.00%	155.00%
Expected term (years)	[1]	1 year 2 months 23 days	1 year 11 months 23 days
Risk-free interest rate	[1]	0.40%	0.67%
Dividend yield	[1]	0.00%	0.00%
Exercise price	[1]	$ 23.00	$ 23.00
Common stock closing price	[1]	$ 3.95	$ 10.50
June 2013 [Member]
Fair Value Assumptions and Methodology for Assets and Liabilities [Line Items]
Volatility	[1]		155.00%
Expected term (years)	[1]		3 years 5 months 27 days
Risk-free interest rate	[1]		1.23%
Dividend yield	[1]		0.00%
Exercise price	[1]		$ 7.00
Common stock closing price	[1]		$ 10.50
July 2013 [Member]
Fair Value Assumptions and Methodology for Assets and Liabilities [Line Items]
Volatility	[1]		155.00%
Expected term (years)	[1]		3 years 6 months 15 days
Risk-free interest rate	[1]		1.25%
Dividend yield	[1]		0.00%
Exercise price	[1]		$ 7.00
Common stock closing price	[1]		$ 10.50
December 2013 [Member]
Fair Value Assumptions and Methodology for Assets and Liabilities [Line Items]
Volatility	[1]		151.00%
Expected term (years)	[1]		3 years 11 months 23 days
Risk-free interest rate	[1]		1.37%
Dividend yield	[1]		0.00%
Exercise price	[1]		$ 12.50
Common stock closing price	[1]		$ 10.50

[1] See Note 6 - Warrants below for further description of the respective series of warrants.