Condensed Consolidated Statement of Stockholders' Equity - 6 months ended Jun. 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	2,142,195			2,143,083
Issuance of common stock in connection with exercise of warrants (in shares)	887,585
Issuance of restricted stock	$ 1,088	(1,088)			0
Issuance of restricted stock (in shares)	1,088,131
Forfeiture of restricted stock	$ (21)	21			0
Forfeiture of restricted stock (in shares)	(20,625)
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 offering (net of offering costs of $0.6 million)	$ 3,454	34,916,076			34,919,530
Issuance of common stock in At-the-Market offering (net of offering costs of $0.6 million) (in shares)	3,454,253
Compensation in respect of restricted stock granted to employees, directors and consultants		7,485,183			7,485,183
Net loss				(56,080,593)	(56,080,593)
Balance at Jun. 30, 2017	$ 68,127	$ 370,608,641	$ (234,337)	$ (292,467,413)	$ 77,975,018
Balance (in shares) at Jun. 30, 2017	68,127,202		41,309