Consolidated Balance Sheets (USD $)	Jun. 30, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 17,222,918	$ 8,049,237
Accounts receivable, net of allowance for doubtful accounts of $12,536 at June 30, 2013 and December 31, 2012	0	669,310
Prepaid expenses and other	233,948	189,465
Total current assets	17,456,866	8,908,012
Property and equipment, net	60,445	52,556
Other assets	21,290	17,427
Total assets	17,538,601	8,977,995
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	599,007	504,851
Payable to related party	0	86,683
Accrued liabilities	150,726	151,219
Total current liabilities	749,733	742,753
Commitments and contingencies
Stockholders' equity :
Convertible preferred stock, $1.00 par value; 5,000,000 shares authorized and 0 shares issued and outstanding at June 30, 2013 and December 31, 2012	0	0
Common stock, $.01 par value: 170,000,000 shares authorized at June 30, 2013 and December 31, 2012; 27,102,583 and 22,582,938 shares issued and outstanding at June 30, 2013 and December 31, 2012, respectively	271,024	225,828
Additional paid-in capital	420,871,062	409,374,905
Treasury stock, at cost: 79,545 shares held at June 30, 2013 and December 31, 2012	(8,034,244)	(8,034,244)
Accumulated deficit	(396,318,974)	(393,331,247)
Total stockholders' equity	16,788,868	8,235,242
Total liabilities and stockholders' equity	$ 17,538,601	$ 8,977,995