NOTE 6. INVESTMENTS

The following tables summarize the Company’s available-for-sale investments at March 31, 2017, and December 31, 2016:



AVAILABLE-FOR-SALE INVESTMENTS
March 31, 2017
(in thousands)
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Certificates of deposit	$	8,238	$	—	$	—		$	8,238
US Treasury securities	7,052		—		(12		)	7,040
US Agency securities	5,010		—		(16		)	4,994
Asset-backed securities	5,527		—		(2		)	5,525
Corporate notes and bonds	28,268		1		(37		)	28,232
Total	$	54,095	$	1	$	(67	)	$	54,029



AVAILABLE-FOR-SALE INVESTMENTS
December 31, 2016
(in thousands)
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Certificates of deposit	$	7,257	$	—	$	—		$	7,257
US Treasury securities	8,553		1		(10		)	8,544
US Agency securities	4,514		—		(13		)	4,501
Asset-backed securities	5,554		3		—			5,557
Corporate notes and bonds	32,717		3		(60		)	32,660
Total	$	58,595	$	7	$	(83	)	$	58,519

The following table summarizes the maturities of the Company’s available-for-sale securities at March 31, 2017, and December 31, 2016:



AVAILABLE-FOR-SALE INVESTMENT MATURITIES
(in thousands)
	March 31, 2017				December 31, 2016
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Due in less than 1 year	$	43,285	$	43,245	$	45,391	$	45,344
Due in 1-5 years	10,810		10,784		13,204		13,175
Total	$	54,095	$	54,029	$	58,595	$	58,519

Proceeds from sales of marketable securities (including principal paydowns) for the three months ended March 31, 2017, and 2016, were $0 and $500,000 respectively. The Company determines gains and losses of marketable securities based on specific identification of the securities sold. There were no gross realized gains and losses from sales of marketable securities for the three months ended March 31, 2017, and 2016.

No other-than-temporary impairments are recorded as no material investment had a fair value that remained less than its cost for more than twelve months as of March 31, 2017, and there have been no other indicators of impairment. The Company does not intend to sell investments and it is more likely than not that we will not be required to sell investments before recovering the amortized cost.

Additional information regarding the fair value of our financial instruments is included in Note 4, Fair Value of Financial Instruments.