5. Marketable Securities

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

	June 30, 2015
	Amortized Cost Value		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Cash and cash equivalents:
Cash	$	4,012	$	—	$	—		$	4,012
Money market funds	40,358		—		—			40,358

Total	$	44,370	$	—	$	—		$	44,370

Marketable securities:
Domestic corporate debt securities	$	123,188	$	5	$	(48	)	$	123,145
Domestic corporate commercial paper	56,445		53		—			56,498

Total	$	179,633	$	58	$	(48	)	$	179,643

	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 June 30, 2015 or December 31, 2014. There were 33 debt securities in an unrealized loss position for less than 12 months at June 30, 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 June 30, 2015 was less than $48 thousand and the fair value was $92.5 million. 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 June 30, 2015.

As of June 30, 2015, marketable securities consisted of investments that mature within one year.