Equity (Details 3) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	6 Months Ended	12 Months Ended
	Sep. 10, 2014	Sep. 30, 2012	Jun. 30, 2015	Dec. 31, 2014
Weighted Average Exercise Price Per Share
Warrant Liability			$ 687	$ 1,554
Company's stock volatility (as a percent)			85.00%	90.00%
Sentient | Private Placement
Number of Underlying Shares
Units Issued During Period New Issues	5,800,000
Weighted Average Exercise Price Per Share
Outstanding at the end of period (in dollars per share)	$ 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
Warrant
Number of Underlying Shares
Outstanding at the beginning of period (in shares)			8,777,409
Units Issued During Period New Issues	4,746,000
Outstanding at the end of period (in shares)			8,777,409	8,777,409
Weighted Average Exercise Price Per Share
Outstanding at the beginning of period (in dollars per share)			$ 3.95
Outstanding at the end of period (in dollars per share)			$ 3.95	$ 3.95
2014 Warrants
Weighted Average Exercise Price Per Share
Warrant Liability			$ 700
2012 Warrants | Sentient | Private Placement
Number of Underlying Shares
Dilution adjustment			599,760
Outstanding at the end of period (in shares)			3,431,649
Outstanding warrants after dilution adjustment			4,031,409
Weighted Average Exercise Price Per Share
Outstanding at the end of period (in dollars per share)		$ 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		0.5