CONDENSED BALANCE SHEETS (Unaudited) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 39,412,296	$ 11,483,112
Short-term investments	50,621,593	27,084,980
Receivables	3,494,662	117,527
Interest receivable	75,543	8,464
Prepaid expenses and other current assets	2,076,164	2,329,742
Total current assets	95,680,258	41,023,825
Equipment and furnishings, net	824,491	175,452
Goodwill	183,780	183,780
Other assets	119,501	116,998
Total assets	96,808,030	41,500,055
Current liabilities:
Accounts payable	5,419,228	3,853,531
Accrued expenses and other current liabilities	8,573,633	2,802,833
Warrant liability	4,621,974	24,182,324
Total current liabilities	18,614,835	30,838,688
Commitments and contingencies
Stockholders' equity
Preferred Stock, $0.01 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, $0.001 par value, 250,000,000 shares authorized; 55,921,986 shares issued and outstanding at September 30, 2014; 42,116,964 shares issued and outstanding at December 31, 2013	55,924	42,118
Additional paid-in capital	373,782,442	289,426,100
Treasury stock, at cost (185,405 shares at September 30, 2014 and 143,796 shares at December 31, 2013)	(2,575,364)	(2,417,247)
Accumulated deficit	(293,069,807)	(276,389,604)
Total stockholders' equity	78,193,195	10,661,367
Total liabilities and stockholders' equity	$ 96,808,030	$ 41,500,055