Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2015

Marketable Securities.

Schedule of available-for-sale marketable securities and cash and cash equivalents

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