Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
ASSETS
Cash and cash equivalents	$ 1,131	$ 6,378
Restricted cash	1,178
Accounts receivable	226
Inventory	6	57
Prepaid expenses and other current assets	146	302
Total current assets	2,687	6,737
Restricted cash	100	70
Property and equipment, net	72	120
Long-term inventory		303
Deferred financing costs	107	291
Total assets	2,866	7,521
LIABILITIES AND STOCKHOLDERS’ DEFICIT
Accounts payable	945	1,123
Accrued research contract costs	1,585	929
Other accrued liabilities	1,494	1,281
Notes and loans payable	3,932	8,022
Deferred revenue, current portion	314	882
Total current liabilities	8,270	12,237
Deferred revenue	7,567	12,065
Deferred rent and other noncurrent liabilities	197	365
Total liabilities	16,034	24,667
Commitments and contingencies (Note 10)
Common stock, $.0001 par value; authorized 225,000,000 shares; issued 92,224,543 shares and 71,007,834 shares at September 30, 2012 and December 31, 2011, respectively	9	7
Additional paid-in capital	234,171	218,955
Warrants	21,570	31,156
Accumulated deficit	(267,939)	(266,238)
Accumulated other comprehensive loss	(904)	(951)
Treasury stock, at cost (4,167 shares)	(75)	(75)
Total stockholders’ deficit	(13,168)	(17,146)
Total liabilities and stockholders’ deficit	$ 2,866	$ 7,521