2. Investments (Tables)

12 Months Ended

Dec. 31, 2018

Investments Schedule [Abstract]

Investments

					Gross Unrealized
	Level		Cost		Gains		Losses			Fair value
As of December 31, 2018:
Short-term Investments:
Bonds		2	$	8,409	$	--	$	(13	)	$	8,396
Commercial Paper		2	$	1,275	$	--	$	--		$	1,275
Long-term Investments:
Bonds		2	$	17,513	$	--	$	(198	)	$	17,315
Mutual funds		1	$	795	$	--	$	(121	)	$	674
Equity investment		2	$	5,675	$	--	$	(2,814	)	$	2,861
As of December 31, 2017:
Short-term Investments:
Certificates of deposit		2	$	4,020	$	--	$	(3	)	$	4,017
Commercial paper		2	$	31,220	$	26	$	(38	)	$	31,208
Corporate bonds		2	$	6	$	--	$	--		$	6
Mutual funds		1	$	219	$	3	$	--		$	222
Long-term Investments:
Corporate bonds		2	$	5,000	$	--	$	(75	)	$	4,925
Equity investment		2	$	5,675	$	--	$	(1,539	)	$	4,136