CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 10,816	$ 13,638
Other current assets	545	352
Total current assets	11,361	13,990
Property and equipment, net	841	1,188
Total assets	12,202	15,178
Current liabilities:
Accounts payable and accrued expenses	2,918	3,247
Accrued employee benefits	299	383
Current portion of long-term debt	10	34
Warrant liabilities	4,025	1,995
Total current liabilities	7,252	5,659
Long-term debt		6
Total liabilities	7,252	5,665
Total convertible preferred stock		41,613
Shareholders' equity (deficit):
Common stock, no par value; shares authorized - 150,000; shares issued and outstanding - 43,784 and 86,443, respectively	251,358	243,215
Deficit accumulated during the development stage	(284,797)	(275,315)
Total shareholders' equity (deficit)	4,950	(32,100)
Total liabilities, convertible preferred stock and shareholders' equity (deficit)	12,202	15,178
Series B-1 non-voting convertible preferred stock
Current liabilities:
Total convertible preferred stock		3,923
Series B-2 voting convertible preferred stock
Current liabilities:
Total convertible preferred stock		37,690
Series B-2 voting convertible preferred stock
Shareholders' equity (deficit):
Total convertible preferred stock	$ 38,389