Marketable Securities

12 Months Ended

Dec. 31, 2015

Marketable Securities.

Marketable Securities

3. Marketable Securities

        Available-for-sale marketable securities and cash and cash equivalents consist of the following (in thousands):

	December 31, 2015
	Amortized Cost Value		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Cash and cash equivalents:
Cash	$	2,934	$	—	$	—		$	2,934
Money market		83,257		—		—			83,257
Domestic corporate commercial paper		39,984		—		—			39,984
Government-sponsored enterprise debt securities		15,996		—		—			15,996
Domestic corporate debt securities		10,007		—		—			10,007
Asset-backed securities		7,500		—		—			7,500
Total	$	159,678	$	—	$	—		$	159,678
Marketable securities:
Domestic corporate debt securities	$	173,142	$	—	$	(107	)	$	173,035
Domestic corporate commercial paper		84,004		154		—			84,158
Asset-backed securities		56,510		1		(43	)		56,468
Total	$	313,656	$	155	$	(150	)	$	313,661

	December 31, 2014
	Amortized Cost Value		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Cash and cash equivalents:
Cash	$	1,519	$	—	$	—		$	1,519
Money market funds		23,994		—		—			23,994
Domestic corporate debt securities		3,005		—		—			3,005
Total	$	28,518	$	—	$	—		$	28,518
Marketable securities:
Domestic corporate debt securities		69,542		—		(33	)		69,509
Domestic corporate commercial paper		7,237		12		—			7,249
Total	$	76,779	$	12	$	(33	)	$	76,758

        There were no debt securities that had been in an unrealized loss position for more than 12 months as of December 31, 2015 or December 31, 2014. There were 57 debt securities in an unrealized loss position for less than 12 months at December 31, 2015 and there were 34 debt securities that had been in an unrealized loss position for less than 12 months at December 31, 2014. The aggregate unrealized loss on these securities as of December 31, 2015 and 2014 was less than $150 thousand and $34 thousand, respectively, and the fair value was $225.7 million and $68.9 million, respectively. The Company considered the decline in market value for these securities to be primarily attributable to current economic conditions. As it was not more likely than not that the Company would be required to sell these securities before the recovery of their amortized cost basis, which may be maturity, the Company did not consider these investments to be other-than-temporarily impaired as of December 31, 2015 and 2014.

        As of December 31, 2015 and 2014, marketable securities consisted of investments that mature within one year.