CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 9,226	$ 13,638
Other current assets	300	352
Total current assets	9,526	13,990
Property and equipment, net	1,056	1,188
Total assets	10,582	15,178
Current liabilities:
Accounts payable and accrued expenses	3,015	3,247
Accrued employee benefits	858	383
Current portion of long-term debt	27	34
Warrant liabilities	376	1,995
Total current liabilities	4,276	5,659
Long-term debt	2	6
Total liabilities	4,278	5,665
Total convertible preferred stock	42,876	41,613
Shareholders' deficit:
Common stock, no par value; shares authorized - 150,000; shares issued and outstanding - 43,784 and 45,664, respectively	245,550	243,215
Deficit accumulated during the development stage	(282,122)	(275,315)
Total shareholders' deficit	(36,572)	(32,100)
Total liabilities, convertible preferred stock and shareholders' deficit	10,582	15,178
Series B-1 non-voting convertible preferred stock
Current liabilities:
Total convertible preferred stock	5,186	3,923
Series B-2 voting convertible preferred stock
Current liabilities:
Total convertible preferred stock	$ 37,690	$ 37,690