BALANCE SHEETS - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 22,261,372	$ 32,218,905
Short-term investments	35,035,420	45,621,593
Receivables	4,593,475	2,019,293
Interest receivable	28,130	104,627
Prepaid expenses and other current assets	2,373,708	3,250,355
Total current assets	64,292,105	83,214,773
Equipment and furnishings, net	1,467,681	970,873
Goodwill	183,780	183,780
Other assets	1,080,872	1,323,156
Total assets	67,024,438	85,692,582
Current liabilities:
Accounts payable	8,058,624	6,655,962
Accrued expenses and other current liabilities	9,693,359	5,994,072
Non-cash litigation settlement due in shares of common stock	4,500,000	0
Warrant liability	693,457	5,131,085
Total current liabilities	$ 22,945,440	$ 17,781,119
Commitment and contingencies
Stockholders' equity:
Preferred Stock, $.01 par value, 5,000,000 shares authorized, including 25,000 shares of Series A Junior Participating Preferred Stock; no shares issued and outstanding	$ 0	$ 0
Common stock, $.001 par value, 250,000,000 shares authorized; 66,480,065 and 55,921,986 shares issued and outstanding at December 31, 2015 and 2014, respectively	66,480	55,924
Additional paid-in capital	409,107,292	376,975,984
Treasury stock, at cost (199,275 shares at December 31, 2014)	0	(2,612,861)
Accumulated deficit	(365,094,774)	(306,507,584)
Total stockholders' equity	44,078,998	67,911,463
Total liabilities and stockholders' equity	$ 67,024,438	$ 85,692,582