2. Investments (Tables)

12 Months Ended

Dec. 31, 2015

Investments Schedule [Abstract]

Investments, Held-to-Maturity Securities

			Gross Unrealized
	Cost		Gains		Losses			Fair value
As of December 31, 2015:
Short-term Investments:
Corporate bonds	$	44	$	--	$	--		$	44
Long-term Investments:
Corporate bonds	$	5,555	$	--	$	(30	)	$	5,525
As of December 31, 2014:
Short-term Investments:
Corporate bonds	$	3,084	$	--	$	(6	)	$	3,078
Long-term Investments:
Corporate and government bonds	$	18,428	$	21	$	(292	)	$	18,157

Investments, Available for sale

			Gross Unrealized
	Cost		Gains		Losses		Fair value
As of December 31, 2015:
Long-term Investments:
Equity investments	$	3,876	$	435	$	--	$	4,311

As of December 31, 2014:
Long-term Investments:
Equity investments	$	3,708	$	--	$	(376	)	$	3,332