CONDENSED BALANCE SHEETS (Unaudited) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 45,995,642	$ 56,959,485
Receivables	440,177	183,703
Prepaid expenses and other current assets	2,016,636	3,434,238
Total current assets	48,452,455	60,577,426
Equipment and furnishings, net	1,177,271	1,959,667
Goodwill	183,780	183,780
Other assets	35,869	48,911
Total assets	49,849,375	62,769,784
Current liabilities:
Accounts payable	5,033,748	6,406,445
Accrued expenses and other current liabilities	2,897,266	3,830,498
Warrant liabilities	2,467,011	3,789,391
Term loan, net - current	11,052,705	5,481,656
Deferred revenues	6,924,353	0
Total current liabilities	28,375,083	19,507,990
Long term loan, net	0	18,484,510
Total liabilities	28,375,083	37,992,500
Commitments and contingencies
Stockholders' equity (2016 restated to reflect a 1-6 reverse stock split, see Note 1):
Common stock, $0.001 par value, 41,666,667 shares authorized; 27,637,634 shares issued and outstanding at September 30, 2017; 18,553,816 shares issued and outstanding at December 31, 2016	27,638	18,554
Additional paid-in capital	467,839,469	440,106,725
Accumulated deficit	(446,392,815)	(415,865,995)
Total stockholders' equity	21,474,292	24,777,284
Total liabilities and stockholders' equity	49,849,375	62,769,784
Series A Junior Participating Preferred Stock [Member]
Stockholders' equity (2016 restated to reflect a 1-6 reverse stock split, see Note 1):
Preferred Stock	0	0
Series B Convertible Preferred Shares [Member]
Stockholders' equity (2016 restated to reflect a 1-6 reverse stock split, see Note 1):
Preferred Stock	$ 0	$ 518,000