CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
General and administrative expense	$ 4,947	$ 5,228
Operating loss	(4,947)	(5,228)
Other income (loss), net	249	0
Interest income	801	420
Interest expense	(1,198)	(1,149)
Equity loss	(17,002)	(9,495)
Net loss before income taxes	(22,097)	(15,452)
Income tax benefit (expense)	0	0
Net loss	$ (22,097)	$ (15,452)
Net loss per share:
Basic (in dollars per share)	$ (1.08)	$ (0.76)
Diluted (in dollars per share)	$ (1.08)	$ (0.76)
Weighted average shares used in computing loss per share:
Basic (in shares)	20,380	20,448
Diluted (in shares)	20,380	20,448