Fair Value of Financial Assets and Liabilities - Derivative Instruments (Valuation Assumptions for November 2016 Warrants) (Details) - November 2016 Warrant Derivative Liability [Member] - $ / shares		12 Months Ended
	Nov. 22, 2016	Dec. 31, 2016
Fair Value Assumptions and Methodology for Assets and Liabilities [Line Items]
Volatility	116.00%	112.00%
Expected term (years)	5 years	4 years 10 months 21 days
Risk-free interest rate	1.77%	1.91%
Dividend yield	0.00%	0.00%
Exercise price	$ 0.75	$ 0.75
Common stock closing price	$ 0.62	$ 0.44