Equity - Common Stock Warrants (Details)			1 Months Ended		12 Months Ended
	Sep. 10, 2014 $ / shares shares	Sep. 04, 2014	Feb. 11, 2016 item $ / shares shares	Sep. 30, 2012 $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Feb. 10, 2016 shares	Jan. 19, 2016 shares	Jan. 18, 2016 shares
Weighted Average Exercise Price Per Share
Warrant Liability | $					$ 210,000	$ 1,554,000
Closing stock price (in dollars per share) | $ / shares					$ 0.20	$ 0.54
Volatility (as a percent)					85.00%	90.00%
Applicable risk free interest rate (as a percent)					1.48%	1.60%
Sentient | Private Placement
Number of Underlying Shares
Units Issued During Period New Issues	5,800,000
Weighted Average Exercise Price Per Share
Outstanding at end of period (in dollars per share) | $ / shares	$ 1.21
Number of shares of common stock per capital unit (in shares)	1
Term of warrants	5 years
Number of common shares which can be purchased with each warrant	0.50
Applicable risk free interest rate (as a percent)		1.60%
Warrant
Number of Underlying Shares
Outstanding at the beginning of year (in shares)					8,777,409	5,263,578
Granted during the year						4,746,000
Dilution adjustment						599,760
Expired during period						(1,831,929)
Outstanding at end of year (in shares)					8,777,409	8,777,409
Weighted Average Exercise Price Per Share
Outstanding at beginning of year (in dollars per share) | $ / shares					$ 3.95	$ 12.10
Granted during period | $ / shares						1.21
Dilution adjustment | $ / shares						7.17
Expired during period | $ / shares						19.00
Outstanding at end of period (in dollars per share) | $ / shares					$ 3.95	$ 3.95
Warrant | Subsequent Event
Weighted Average Exercise Price Per Share
Number of anti-dilution adjustments | item			2
2012 Warrants
Weighted Average Exercise Price Per Share
Warrant Liability | $					$ 5,000
2012 Warrants | Subsequent Event
Weighted Average Exercise Price Per Share
Outstanding at beginning of year (in dollars per share) | $ / shares			$ 7.17
Outstanding at end of period (in dollars per share) | $ / shares			$ 5.09
Number of common shares that can be purchased upon exercise of warrant			5,677,757				5,084,193	5,084,193	4,031,409
Increase (Decrease) In Class Of Warrant Or Right Number Of Securities Called By Warrants Or Rights			593,564					1,052,784
2012 Warrants | Sentient | Private Placement
Number of Underlying Shares
Outstanding at end of year (in shares)					3,431,649
Outstanding warrants after dilution adjustment					4,031,409
Weighted Average Exercise Price Per Share
Outstanding at end of period (in dollars per share) | $ / shares				$ 8.42	$ 7.17
Number of shares of common stock per capital unit (in shares)				1
Term of warrants				5 years
Number of common shares which can be purchased with each warrant				0.50
2014 Warrants
Weighted Average Exercise Price Per Share
Warrant Liability | $					$ 205,000
2014 Warrants | Subsequent Event
Weighted Average Exercise Price Per Share
Outstanding at beginning of year (in dollars per share) | $ / shares			$ 1.21
Outstanding at end of period (in dollars per share) | $ / shares			$ 0.91
Number of common shares that can be purchased upon exercise of warrant			5,365,983				5,108,347	5,108,347	4,746,000
Increase (Decrease) In Class Of Warrant Or Right Number Of Securities Called By Warrants Or Rights			257,636					362,347