Condensed Consolidated Balance Sheets (USD $)	Jun. 30, 2011	Dec. 31, 2010
Current assets
Cash and cash equivalents	$ 5,564,198	$ 5,575,310
Trade accounts receivable, net of allowance of $0 and $65,000	320,515	285,859
Grants receivable		270,128
Other receivables	35,047	74,110
Prepaid research expenses	297,140	464,322
Prepaid expenses and other assets	102,286	155,261
Total current assets	6,319,186	6,824,990
Property and equipment, net of accumulated depreciation of $231,988 and $197,971	122,518	154,161
Patents, net of accumulated amortization of $1,941 and $50,725	205	2,296
Deposit	35,625	35,625
Total assets	6,477,534	7,017,072
Current liabilities
Accounts payable and accrued expenses	261,764	1,211,561
Accrued salaries and benefits	345,958	563,706
Deferred revenue	68,442	170,641
Total current liabilities	676,164	1,945,908
Deferred compensation		550,000
Deferred rent	64,877	80,945
Total liabilities	741,041	2,576,853
Commitments and contingencies
Stockholders' equity
Preferred stock, $0.01 par value, 2,000,000 shares authorized; 5,250 series B issued and 1 outstanding at June 30, 2011 and December 31, 2010
Common stock, $0.01 par value, 5,000,000 shares authorized; 2,570,531 and 2,143,631 issued, 2,562,488 and 2,135,588 outstanding at June 30, 2011 and December 31, 2010, respectively	25,705	21,436
Paid-in capital in excess of par value	41,109,894	38,568,814
Treasury stock, 8,043 shares, at cost at June 30, 2011 and December 31, 2010	(464,786)	(464,786)
Accumulated deficit	(34,934,320)	(33,685,245)
Total stockholders' equity	5,736,493	4,440,219
Total liabilities and stockholders' equity	$ 6,477,534	$ 7,017,072