BALANCE SHEETS - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 56,959,485	$ 22,261,372
Short-term investments	0	35,035,420
Receivables	183,703	4,593,475
Interest receivable	0	28,130
Prepaid expenses and other current assets	3,434,238	2,373,708
Total current assets	60,577,426	64,292,105
Equipment and furnishings, net	1,959,667	1,467,681
Goodwill	183,780	183,780
Other assets	48,911	1,080,872
Total assets	62,769,784	67,024,438
Current liabilities:
Accounts payable	6,406,445	8,058,624
Accrued expenses and other current liabilities	3,830,498	9,693,359
Non-cash litigation settlement due in shares of common stock	0	4,500,000
Term loan, net - current	5,481,656	0
Warrant liabilities	3,789,391	693,457
Total current liabilities	19,507,990	22,945,440
Long term loan, net	18,484,510	0
Total liabilities	37,992,500	22,945,440
Commitment and contingencies
Stockholders' equity:
Common stock, $.001 par value, 250,000,000 shares authorized; 111,322,895 and 66,480,065 shares issued and outstanding at December 31, 2016 and 2015, respectively	111,321	66,480
Additional paid-in capital	437,423,958	409,107,292
Accumulated deficit	(415,865,995)	(365,094,774)
Total stockholders' equity	24,777,284	44,078,998
Total liabilities and stockholders' equity	62,769,784	67,024,438
Series A Junior Participating Preferred Stock [Member]
Stockholders' equity:
Preferred Stock	0	0
Series B Convertible Preferred Shares [Member]
Stockholders' equity:
Preferred Stock	$ 3,108,000	$ 0