Condensed Consolidated Balance Sheets (unaudited) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Current Assets:
Cash and cash equivalents	$ 23,259	$ 19,171
Prepaid expenses and other current assets	125	166
Grant and contract receivable	1,262	701
Short-term investments	1,650	0
Total current assets	26,296	20,038
Property and Equipment:
Computers	624	616
Office furniture and lab equipment	909	734
Accumulated depreciation	(865)	(677)
Total property and equipment	668	673
Long-term investments	0	1,650
Long-term assets - other	46	84
TOTAL ASSETS	27,010	22,445
Current Liabilities:
Accounts payable	1,320	1,112
Accrued expenses	1,661	1,530
Current portion of long-term debt	3,430	3,115
Total current liabilities	6,411	5,757
Long-term debt, less current portion	3,937	6,550
Deferred rent	886	935
Derivative liability	3,949	0
Total liabilities	15,183	13,242
Commitments and contingencies
Stockholders' Equity:
Preferred Stock ($0.001 par value; 10,000 shares authorized; 0 issued and outstanding at September 30, 2011 and December 31, 2010)	0	0
Common Stock ($0.001 par value; 250,000 shares authorized; 106,000 and 81,000 issued and outstanding at September 30, 2011 and December 31, 2010)	106	81
Additional paid-in capital	88,921	73,326
Deficit accumulated during the development stage	(77,200)	(64,204)
Total stockholders' equity	11,827	9,203
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 27,010	$ 22,445