Condensed Consolidated Statement of Stockholders' Equity - 3 months ended Mar. 31, 2017 - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Deficit [Member]	Total
Balance at Dec. 31, 2016	$ 56,820	$ 272,432,139	$ (234,337)	$ (236,386,820)	$ 35,867,802
Balance (in shares) at Dec. 31, 2016	56,820,422		41,309
Issuance of common stock in connection with exercise of warrants	$ 888	2,142,196			2,143,084
Issuance of common stock in connection with exercise of warrants (in shares)	887,585
Issuance of restricted stock	$ 111	(111)
Issuance of restricted stock (in shares)	111,254
Forfeiture of restricted stock	$ (4)	4
Forfeiture of restricted stock (in shares)	(4,495)
Issuance of common stock in public offering (net of offering costs of $3,589,875)	$ 5,898	53,713,519			53,719,417
Issuance of common stock in public offering (net of offering costs of $3,589,875) (in shares)	5,897,436
Issuance of common stock in At-the-Market offering (net of offering costs of $554,067)	$ 3,104	31,040,406			31,043,510
Issuance of common stock in At-the-Market offering (net of offering costs of $554,067) (in shares)	3,104,253
Compensation in respect of restricted stock granted to employees, directors and consultants		5,995,455			5,995,455
Net loss				(27,727,509)	(27,727,509)
Balance at Mar. 31, 2017	$ 66,817	$ 365,323,608	$ (234,337)	$ (264,114,329)	$ 101,041,759
Balance (in shares) at Mar. 31, 2017	66,816,455		41,309