Condensed Balance Sheets (Unaudited) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 18,078	$ 17,008
Short-term investments	1,003	17,635
Prepaid expenses and other current assets	471	997
Total current assets	19,552	35,640
Property and equipment, net	577	930
Restricted cash	311	311
Total assets	20,440	36,881
Current liabilities:
Accounts payable	1,048	1,757
Accrued expenses	2,544	1,783
Total current liabilities	3,592	3,540
Other liabilities	195	240
Total liabilities	3,787	3,780
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.01 par value per share, Authorized - 5,000 shares Series A convertible preferred stock, Designated - 1,500 shares, Issued and outstanding - 1 share
Common stock, $0.001 par value per share, Authorized - 70,000 shares Issued and outstanding - 27,634 and 27,596 shares at September 30, 2011 and December 31, 2010, respectively	28	28
Additional paid-in capital	386,883	384,702
Accumulated deficit	(370,258)	(351,642)
Accumulated other comprehensive income	0	13
Total stockholders' equity	16,653	33,101
Total liabilities and stockholders' equity	$ 20,440	$ 36,881