CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]
General and administrative expense	$ 4,835	$ 4,790	$ 16,924	$ 14,681
Operating loss	(4,835)	(4,790)	(16,924)	(14,681)
Other income (loss), net	(4,224)	91	(6,191)	7,994
Interest income	572	696	2,096	2,190
Interest expense	(1,077)	(1,461)	(3,220)	(4,369)
Equity loss	(9,866)	(3,293)	(35,253)	(19,688)
Net loss before income taxes	(19,430)	(8,757)	(59,492)	(28,554)
Income tax benefit (expense)	0	0	0	0
Net loss	$ (19,430)	$ (8,757)	$ (59,492)	$ (28,554)
Net loss per share:
Basic and diluted (in dollars per share)	$ (0.90)	$ (0.42)	$ (2.80)	$ (1.36)
Weighted average shares used in computing basic and diluted loss per share (in shares)	21,494	20,999	21,245	20,935