Net Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net loss - Basic	$ (8,353)	$ (6,774)	$ (24,880)	$ (32,755)
Change in fair value of warrant liability	(666)	(4,141)	(3,681)	3,906
Dilutive Shares Related To Warrants	0	0	0	0
Net loss - Dilutive	$ (8,353)	$ (10,915)	$ (24,880)	$ (32,755)
Weighted Average Number of Shares Outstanding, Basic, Total	91,441,687	85,974,751	91,095,990	77,300,375
Dilutive shares related to warrants	0	1,610,352	0	0
Weighted Average Number of Shares Outstanding, Diluted, Total	91,441,687	87,585,103	91,095,990	77,300,375
Earnings Per Share, Basic, Total	$ (0.09)	$ (0.08)	$ (0.27)	$ (0.42)
Earnings Per Share, Diluted, Total	$ (0.09)	$ (0.12)	$ (0.27)	$ (0.42)