Consolidated Statements of Operations - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
License and Services Revenue	$ 102,000	$ 101,000	$ 204,000	$ 205,000
Operating expenses
Research and development	1,077,000	1,888,000	2,049,000	2,899,000
General and administrative	1,617,000	1,961,000	3,014,000	3,588,000
Total operating expenses	2,694,000	3,849,000	5,063,000	6,487,000
Loss from operations	(2,592,000)	(3,748,000)	(4,859,000)	(6,282,000)
Other income (expense)
Change in fair value of warrant liability	4,604,000	5,404,000	(86,000)	2,166,000
Change in fair value of Preferred B stock derivative liability	8,757,000	12,217,000	1,652,000	6,682,000
Other expense			(431,000)
Total other income (expense)	13,361,000	17,621,000	1,135,000	8,848,000
Net income (loss)	10,769,000	13,873,000	(3,724,000)	2,566,000
Accretion of dividends on Series B convertible preferred stock	(1,828,000)	(318,000)	(2,166,000)	(632,000)
Net income (loss) attributable to common stockholders	$ 8,941,000	$ 13,555,000	$ (5,890,000)	$ 1,934,000
Per share information:
Net income (loss) per share of common stock - basic	$ 1.58	$ 3.69	$ (1.19)	$ 0.53
Weighted average number of shares of common stock outstanding - basic	5,667,170	3,671,801	4,960,416	3,661,314
Net income (loss) per share of common stock - diluted	$ 1.17	$ 2.09	$ (1.19)	$ 0.30
Weighted average number of shares of common stock outstanding - diluted	7,658,556	6,497,619	4,960,416	6,514,181