Fair Value Measurements (Valuation Assumptions Used for November 2016 Offering Warrants) (Details) - $ / shares		6 Months Ended	12 Months Ended
		Jun. 30, 2017	Dec. 31, 2016	Dec. 31, 2017	Jun. 30, 2016
Common stock closing price		$ 0.78	$ 4.40
Common Stock Issuance Agreement [Member]
Number of shares contingently issuable to Holders per CSIA		523,210			523,210
Scenario, Forecast [Member]
Exercise price				$ 0.57
November 2016 Warrant Derivative Liability [Member]
Volatility		115.00%	112.00%
Expected term (years)		4 years 4 months 20 days	4 years 10 months 21 days
Risk-free interest rate		1.75%	1.91%
Dividend yield		0.00%	0.00%
Exercise price	[1]	$ 1.00	$ 7.50
Common stock closing price		$ 0.78	$ 4.40

[1] In connection with the Company's April 2017 1-for-10 reverse stock split, the exercise price of the warrants was adjusted to $1.00 per share pursuant to terms of the warrant agreement. The exercise price of the warrants is subject to further adjustment upon future dilutive issuances of the Company's common stock including, but not limited to, the potential issuance of 523,210 shares of common stock to the shareholders who are party to the Common Stock Issuance Agreement (see Note 6). If the Company's shareholders approve such issuance at the 2017 annual meeting of shareholders, the exercise price of the warrants would be reduced to $0.57 per share.