Cash, Cash Equivalents and Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2016

Cash and Cash Equivalents [Abstract]

Cash, Cash Equivalents and Marketable Securities

Cash, cash equivalents and marketable securities consisted of the following (in thousands):

June 30, 2016
Description	Cost		Unrealized Gains		Unrealized Losses		Estimated Fair Value
Cash	$	10,891	$	—	$	—	$	10,891
Cash equivalents:
Money market mutual funds	171		—		—		171
Total cash and cash equivalents	11,062		—		—		11,062
Short-term marketable securities:
Commercial paper	8,186		—		—		8,186
Corporate notes and bonds	46,976		8		—		46,984
Government obligations	12,008		12		—		12,020
U.S. agency obligations	29,412		3		—		29,415
Total short-term marketable securities	96,582		23		—		96,605
Marketable securities, noncurrent:
Government obligations	1,004		2		—		1,006
Total marketable securities, noncurrent	1,004		2		—		1,006
Cash, cash equivalents, short-term marketable securities and marketable securities, noncurrent	$	108,648	$	25	$	—	$	108,673

December 31, 2015
Description	Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Cash	$	9,624	$	—	$	—		$	9,624
Cash equivalents:
Money market mutual funds	246		—		—			246
Total cash and cash equivalents	9,870		—		—			9,870
Short-term marketable securities:
Commercial paper	7,485		—		—			7,485
Corporate notes and bonds	44,483		—		(60		)	44,423
Government obligations	12,010		—		(12		)	11,998
U.S. agency obligations	32,543		—		(39		)	32,504
Total short-term marketable securities	96,521		—		(111		)	96,410
Marketable securities, noncurrent:
Corporate notes and bonds	4,453		—		(17		)	4,436
Government obligations	1,997		—		(4		)	1,993
Total marketable securities, noncurrent	6,450		—		(21		)	6,429
Cash, cash equivalents, short-term marketable securities and marketable securities, noncurrent	$	112,841	$	—	$	(132	)	$	112,709

Estimated Fair Value of Investments in Marketable Securities, Available-for-Sale, Classified by Contractual Maturity Date

As of June 30, 2016, the following table summarizes the estimated fair value of our investments in marketable securities, all of which are considered available-for-sale, classified by the contractual maturity date (in thousands):

Due within 1 year	$	96,605
Due within 1 year through 3 years	1,006
Total marketable securities	$	97,611