Condensed Consolidated Statement of Stockholders' Equity - 9 months ended Sep. 30, 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	2,142,197			2,143,085
Issuance of common stock in connection with exercise of warrants (in shares)	887,585
Issuance of restricted stock	$ 1,112	(1,112)
Issuance of restricted stock (in shares)	1,112,131
Forfeiture of restricted stock	$ (27)	27
Forfeiture of restricted stock (in shares)	(26,625)
Issuance of common stock in public offering (net of offering costs of $3.6 million)	$ 5,898	53,634,115			53,640,013
Issuance of common stock in public offering (net of offering costs of $3.6 million) (in shares)	5,897,436
Issuance of common stock in At-the-Market offerings (net of offering costs of $1.1 million)	$ 6,003	63,129,802			63,135,805
Issuance of common stock in At-the-Market offerings (net of offering costs of $1.1 million) (in shares)	6,002,627
Compensation in respect of restricted stock granted to employees, directors and consultants		12,375,306			12,375,306
Net loss				(87,616,245)	(87,616,245)
Balance at Sep. 30, 2017	$ 70,694	$ 403,712,474	$ (234,337)	$ (324,003,065)	$ 79,545,766
Balance (in shares) at Sep. 30, 2017	70,693,576		41,309