CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 4,494	$ 13,638
Other current assets	236	352
Total current assets	4,730	13,990
Property and equipment, net	953	1,188
Total assets	5,683	15,178
Current liabilities:
Accounts payable and accrued expenses	3,334	3,247
Accrued employee benefits	458	383
Current portion of long-term debt	19	34
Warrant liabilities	31	1,995
Total current liabilities	3,842	5,659
Long-term debt		6
Total liabilities	3,842	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	245,976	243,215
Deficit accumulated during the development stage	(287,011)	(275,315)
Total shareholders' deficit	(41,035)	(32,100)
Total liabilities, convertible preferred stock and shareholders' deficit	5,683	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