BALANCE SHEETS - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 37,643,404	$ 56,959,485
Receivables	7,529,032	183,703
Prepaid expenses and other current assets	1,914,077	3,434,238
Total current assets	47,086,513	60,577,426
Equipment and furnishings, net	1,042,892	1,959,667
Goodwill	183,780	183,780
Other assets	34,334	48,911
Total assets	48,347,519	62,769,784
Current liabilities:
Accounts payable	4,122,017	6,406,445
Accrued expenses and other current liabilities	8,029,274	3,830,498
Deferred revenue	6,924,353	0
Term loan, net - current	10,599,795	5,481,656
Warrant liabilities	527,025	3,789,391
Total current liabilities	30,202,464	19,507,990
Long term loan, net	0	18,484,510
Total liabilities	30,202,464	37,992,500
Commitment 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; 28,037,501 and 18,553,817 shares issued and outstanding at December 31, 2017 and 2016, respectively	28,037	18,553
Additional paid-in capital	468,969,445	440,106,726
Accumulated deficit	(450,852,427)	(415,865,995)
Total stockholders' equity	18,145,055	24,777,284
Total liabilities and stockholders' equity	48,347,519	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