Condensed Consolidated Statements of Operations - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues:
Product sales	$ 0	$ 0	$ 0	$ 0
Costs and expenses:
Research and development	970,989	1,013,929	3,747,683	3,395,362
General and administrative	625,878	676,927	1,961,463	3,356,804
Costs and expenses	1,596,867	1,690,856	5,709,146	6,752,166
Interest expense, net	546	5,614	476	23,140
Change in fair value of contingent rights	16,110	(2,978)	12,665	4,422
Net loss	$ (1,613,523)	$ (1,693,492)	$ (5,722,287)	$ (6,779,728)
Net loss per share (basic and diluted) (in dollars per share)	$ (0.03)	$ (0.03)	$ (0.10)	$ (0.15)
Weighted average number of common shares outstanding (basic and diluted) (in shares)	60,196,574	49,227,983	60,196,574	44,132,599