Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
General and administrative expense	$ 9,466	$ 9,982
Operating loss	(9,466)	(9,982)
Other income (loss), net	(7,708)	12,255
Interest income	261	2,044
Interest expense	0	(14,023)
Equity income (loss), net	(20,702)	64,267
Net income (loss) before income taxes	(37,615)	54,561
Income tax benefit (expense)	0	0
Net income (loss)	$ (37,615)	$ 54,561
Net income (loss) per share:
Basic (in dollars per share)	$ (1.81)	$ 2.64
Diluted (in dollars per share)	$ (1.81)	$ 2.64
Weighted average shares used in computing net income (loss) per share:
Basic (in shares)	20,751	20,636
Diluted (in shares)	20,751	20,636