Equity - (Warrants) (Details) $ / shares in Units, $ in Thousands				1 Months Ended		6 Months Ended	22 Months Ended	46 Months Ended
	Jun. 10, 2016 item	May 06, 2016 $ / shares shares	Feb. 11, 2016 item	Sep. 30, 2014 $ / shares shares	Sep. 30, 2012 $ / shares shares	Jun. 30, 2016 USD ($) $ / shares shares	Jun. 30, 2016 USD ($) $ / shares shares	Jun. 30, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($)
Weighted Average Exercise Price Per Share
Common stock issued (in shares)		8,000,000
Warrant liability | $						$ 2,486	$ 2,486	$ 2,486	$ 210
Sale price (in dollars per shares) | $ / shares		$ 0.50
Sentient Loan
Weighted Average Exercise Price Per Share
Stock price trigger (as a percent)	90.00%		90.00%
Consecutive trading days, period | item	15		15
Warrant
Number of Underlying Shares
Outstanding, beginning balance (in shares)						8,777,409
Granted (in shares)						6,000,000
Dilution adjustment (in shares)						2,801,541
Outstanding, end balance (in shares)						17,578,950	17,578,950	17,578,950
Weighted Average Exercise Price Per Share
Outstanding, beginning balance (in dollars per share) | $ / shares						$ 3.95
Granted (in dollars per share) | $ / shares						0.75
Outstanding, end balance (in dollars per share) | $ / shares						$ 2.17	$ 2.17	$ 2.17
2012 Warrants
Number of Underlying Shares
Dilution adjustment (in shares)								2,688,924
Outstanding, end balance (in shares)						6,120,573	6,120,573	6,120,573
Weighted Average Exercise Price Per Share
Outstanding, end balance (in dollars per share) | $ / shares						$ 4.72	$ 4.72	$ 4.72
2012 Warrants | Sentient
Number of Underlying Shares
Granted (in shares)					3,431,649
Weighted Average Exercise Price Per Share
Outstanding, end balance (in dollars per share) | $ / shares					$ 8.42
Common stock issued (in shares)					1
Number of common shares which can be purchased with each warrant					0.5
Term of warrants					5 years
2014 Warrants
Number of Underlying Shares
Dilution adjustment (in shares)							712,377
Outstanding, end balance (in shares)						5,458,377	5,458,377	5,458,377
Weighted Average Exercise Price Per Share
Outstanding, end balance (in dollars per share) | $ / shares						$ 0.87	$ 0.87	$ 0.87
2014 Warrants | Sentient
Number of Underlying Shares
Granted (in shares)				4,746,000
Weighted Average Exercise Price Per Share
Outstanding, end balance (in dollars per share) | $ / shares				$ 1.21
Common stock issued (in shares)				1
Number of common shares which can be purchased with each warrant				0.5
Term of warrants				5 years
2016 Warrants
Number of Underlying Shares
Granted (in shares)		6,000,000
Outstanding, end balance (in shares)		6,000,000
Weighted Average Exercise Price Per Share
Outstanding, end balance (in dollars per share) | $ / shares		$ 0.75
Number of common shares which can be purchased with each warrant		0.75
Term of warrants		5 years
Warrant becomes exercisable		6 months
Level 3 | Warrant
Weighted Average Exercise Price Per Share
Warrant liability | $						$ 2,500	$ 2,500	$ 2,500
Level 3 | 2012 Warrants
Weighted Average Exercise Price Per Share
Warrant liability | $						2,200	2,200	2,200
Level 3 | 2014 Warrants
Weighted Average Exercise Price Per Share
Warrant liability | $						$ 300	$ 300	$ 300