Investments

Cash, cash equivalents and investments as of December 31, 2015 included the following:



			GROSS		GROSS
	AMORTIZED		UNREALIZED		UNREALIZED			FAIR
(in thousands)	COST		GAINS		LOSSES			VALUE
Cash and cash equivalents:
Cash and money market accounts	$	91,060	$	—	$	—		$	91,060
Total cash and cash equivalents	$	91,060	$	—	$	—		$	91,060
Investments:
Certificates of deposit (due within 1 year)	$	13,611	$	1	$	(7	)	$	13,605
Certificates of deposit (due within 2 years)	4,760		—		(10		)	4,750
Commercial paper (due within 1 year)	5,977		—		(11		)	5,966
Corporate bonds (due within 1 year)	24,002		—		(65		)	23,937
Corporate bonds (due within 2 years)	9,142		—		(84		)	9,058
Government agencies (due within 1 year)	1,997		—		(3		)	1,994
Total investments	$	59,489	$	1	$	(180	)	$	59,310
Total cash, cash equivalents, and investments	$	150,549	$	1	$	(180	)	$	150,370

Cash, cash equivalents and investments as of December 31, 2014 included the following:



			GROSS		GROSS
	AMORTIZED		UNREALIZED		UNREALIZED			FAIR
(in thousands)	COST		GAINS		LOSSES			VALUE
Cash and cash equivalents:
Cash and money market accounts	$	84,613	$	—	$	—		$	84,613
Certificates of deposit	472		—		—			472
Corporate bonds	501		—		—			501
Total cash and cash equivalents	$	85,586	$	—	$	—		$	85,586
Investments:
Certificates of deposit (due within 1 year)	$	25,823	$	—	$	(9	)	$	25,814
Certificates of deposit (due within 2 years)	4,429		1		(3		)	4,427
Commercial paper (due within 1 year)	5,988		1		(3		)	5,986
Corporate bonds (due within 1 year)	16,487		—		(24		)	16,463
Corporate bonds (due within 2 years)	13,912		—		(64		)	13,848
Government agencies (due within 1 year)	6,082		—		(6		)	6,076
Total investments	$	72,721	$	2	$	(109	)	$	72,614
Total cash, cash equivalents, and investments	$	158,307	$	2	$	(109	)	$	158,200