CONSOLIDATED BALANCE SHEETS (USD $)	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 11,483,112	$ 14,344,088
Short-term investments	27,084,980	24,000,000
Receivables	117,527	109,802
Interest receivable	8,464	26,517
Prepaid expenses and other current assets	2,329,742	1,212,041
Total current assets	41,023,825	39,692,448
Equipment and furnishings, net	175,452	253,277
Goodwill	183,780	183,780
Other assets	116,998	102,271
Total assets	41,500,055	40,231,776
Current liabilities:
Accounts payable	3,853,531	3,060,516
Accrued expenses and other current liabilities	2,802,833	3,033,189
Warrant liabilities	24,182,324	3,972,230
Total current liabilities	30,838,688	10,065,935
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; 42,116,964 and 30,607,916 shares issued and outstanding at December 31, 2013 and 2012, respectively	42,118	30,608
Additional paid-in capital	289,426,100	261,318,638
Treasury stock, at cost (143,796 shares and 90,546 at December 31, 2013 and 2012, respectively)	(2,417,247)	(2,279,238)
Accumulated deficit	(276,389,604)	(228,904,167)
Total stockholders' equity	10,661,367	30,165,841
Total liabilities and stockholders' equity	$ 41,500,055	$ 40,231,776