Business, Liquidity and Summary of Significant Accounting Policies (Details 3) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Net income (loss) - numerator basic	$ 769	$ (7,123)	$ 2,087	$ (18,280)
Change in fair value liability for price adjustable warrants	(2,485)		(6,128)
Net loss excluding change in fair value liability for price adjustable warrants	$ (1,716)	$ (7,123)	$ (4,041)	$ (18,280)
Weighted average common shares outstanding - denominator basic	26,462	25,668	26,047	24,248
Effect of price adjustable warrants	4,477		7,437
Weighted average dilutive common shares outstanding	30,939	25,668	33,484	24,248
Net income (loss) per common share - basic (in dollars per share)	$ 0.03	$ (0.28)	$ 0.08	$ (0.75)
Net loss per common share - diluted (in dollars per share)	$ (0.06)	$ (0.28)	$ (0.12)	$ (0.75)