2. Investments (Tables)

12 Months Ended

Dec. 31, 2016

Investments Schedule [Abstract]

Investments, Held-to-Maturity Securities

			Gross Unrealized
	Cost		Gains		Losses			Fair value
As of December 31, 2016:
Short-term Investments:
Certificates of deposit	$	24,000	$	9	$	--		$	24,009
Corporate bonds	$	80	$	--	$	--		$	80
Long-term Investments:
Corporate bonds	$	5,000	$	--	$	(287	)	$	4,713
Equity investments	$	5,675	$	--	$	(730	)	$	4,945
As of December 31, 2015:
Short-term Investments:
Corporate bonds	$	44	$	--	$	--		$	44
Long-term Investments:
Corporate and government bonds	$	5,555	$	--	$	(30	)	$	5,525
Equity investments	$	3,876	$	435	$	--		$	4,311