4. Investments (Tables)

6 Months Ended

Jun. 30, 2017

Investments Schedule [Abstract]

Investments, Held-to-Maturity Securities

			Gross Unrealized
	Cost		Gains		Losses			Fair Value
As of June 30, 2017:
Short-term Investments:
Certificates of Deposit	$	18,107	$	1	$	(2	)	$	18,106
Commercial Paper	$	8,960	$	--	$	(4	)	$	8,956
Corporate bonds	$	6	$	--	$	--		$	6
Long-term Investments
Corporate bonds	$	5,000	$	--	$	(63	)	$	4,937
Equity investments	$	5,675	$	--	$	(629	)	$	5,046

			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