CONDENSED BALANCE SHEETS (Unaudited) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 54,972,846	$ 56,959,485
Receivables	47,631	183,703
Prepaid expenses and other current assets	1,782,141	3,434,238
Total current assets	56,802,618	60,577,426
Equipment and furnishings, net	1,323,579	1,959,667
Goodwill	183,780	183,780
Other assets	38,014	48,911
Total assets	58,347,991	62,769,784
Current liabilities:
Accounts payable	7,080,080	6,406,445
Accrued expenses and other current liabilities	2,972,082	3,830,498
Warrant liabilities	6,567,080	3,789,391
Term loan, net - current	6,701,040	5,481,656
Total current liabilities	23,320,282	19,507,990
Long term loan, net	15,813,507	18,484,510
Total liabilities	39,133,789	37,992,500
Commitments and contingencies
Stockholders' equity:
Common stock, $0.001 par value, 250,000,000 shares authorized; 153,127,389 shares issued and outstanding at June 30, 2017; 111,322,895 shares issued and outstanding at December 31, 2016	153,126	111,321
Additional paid-in capital	460,329,472	437,423,958
Accumulated deficit	(441,268,396)	(415,865,995)
Total stockholders' equity	19,214,202	24,777,284
Total liabilities and stockholders' equity	58,347,991	62,769,784
Series A Junior Participating Preferred Stock [Member]
Stockholders' equity:
Preferred Stock	0	0
Series B Convertible Preferred Shares [Member]
Stockholders' equity:
Preferred Stock	$ 0	$ 3,108,000