Consolidated Statements of Operations - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Consolidated Statement of Operations [Abstract]
Revenue	$ 103,000	$ 102,000	$ 209,000	$ 204,000
Operating expenses
Research and development	1,241,000	1,077,000	3,221,000	2,049,000
General and administrative	2,451,000	1,617,000	5,095,000	3,014,000
Total operating expenses	3,692,000	2,694,000	8,316,000	5,063,000
Loss from operations	(3,589,000)	(2,592,000)	(8,107,000)	(4,859,000)
Other income (expense)
Change in fair value of warrant liability	(35,000)	13,361,000	1,371,000	1,566,000
Other expense	(227,000)		(227,000)	(431,000)
Total other income (expense)	(262,000)	13,361,000	1,144,000	1,135,000
Net loss	(3,851,000)	10,769,000	(6,963,000)	(3,724,000)
Excess of fair value of consideration transferred on conversion of Series B Preferred stock	(2,366,000)		(2,366,000)
Accretion of Series B redeemable convertible preferred stock	(133,000)	(1,828,000)	(1,858,000)	(2,166,000)
Net loss attributable to common stockholders	$ (6,350,000)	$ 8,941,000	$ (11,187,000)	$ (5,890,000)
Per share information:
Net loss per share of common stock - basic	$ (0.73)	$ 1.27	$ (1.53)	$ (1.19)
Weighted average number of shares of common stock outstanding - basic	8,740,621	5,667,170	7,312,062	4,960,416
Net loss per share of common stock - diluted	$ (0.78)	$ (0.33)	$ (1.60)	$ (1.19)
Weighted average number of shares of common stock outstanding - diluted	8,768,059	7,545,487	7,325,781	4,960,416