Condensed Balance Sheets (Unaudited) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 21,492	$ 17,008
Short-term investments	2,016	17,635
Prepaid expenses and other current assets	837	997
Total current assets	24,345	35,640
Property and equipment, net	697	930
Restricted cash	311	311
Total assets	25,353	36,881
Current liabilities:
Accounts payable	1,139	1,757
Accrued expenses	2,523	1,783
Total current liabilities	3,662	3,540
Other liabilities	217	240
Total liabilities	3,879	3,780
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.01 par value, Authorized - 5,000 shares Series A convertible preferred stock, Designated - 1,500 shares, Issued and outstanding - 1 share	0	0
Common stock, $0.001 par value, Authorized - 70,000 shares Issued and outstanding - 27,626 and 27,596 shares at June 30, 2011 and December 31, 2010, respectively	28	28
Additional paid-in capital	386,215	384,702
Accumulated deficit	(364,769)	(351,642)
Accumulated other comprehensive income	0	13
Total stockholders' equity	21,474	33,101
Total liabilities and stockholders' equity	$ 25,353	$ 36,881