Net Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net loss - Basic	$ (4,255)	$ (5,764)	$ (7,101)	$ (16,842)
Change in fair value of warrant liabilities	(2,159)	(3,513)	(7,249)	(3,015)
Dilutive Shares Related To Warrants	0	0	0	0
Net loss - Dilutive	$ (4,255)	$ (9,277)	$ (7,101)	$ (19,857)
Weighted Average Number of Shares Outstanding, Basic, Total	123,005,220	91,015,733	120,241,593	90,921,243
Dilutive shares related to warrants		2,914,807		1,729,974
Weighted Average Number of Shares Outstanding, Diluted, Total	123,005,220	93,930,540	120,241,593	92,651,215
Earnings Per Share, Basic, Total	$ (0.03)	$ (0.06)	$ (0.06)	$ (0.18)
Earnings Per Share, Diluted, Total	$ (0.03)	$ (0.10)	$ (0.06)	$ (0.21)