CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
General and administrative expense	$ 5,228	$ 4,880
Operating loss	(5,228)	(4,880)
Other income (loss), net	0	(388)
Interest income	420	449
Interest expense	(1,149)	(1,122)
Equity loss	(9,495)	(8,662)
Net loss before income taxes	(15,452)	(14,603)
Income tax benefit (expense)	0	0
Net loss	$ (15,452)	$ (14,603)
Net loss per share:
Basic (in dollars per share)	$ (0.76)	$ (0.70)
Diluted (in dollars per share)	$ (0.76)	$ (0.70)
Weighted average shares used in computing loss per share:
Basic (in shares)	20,448	20,861
Diluted (in shares)	20,448	20,861