Cash, Cash Equivalents and Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2015

Cash and Cash Equivalents [Abstract]

Cash and Cash Equivalents and Marketable Securities

Cash and cash equivalents and marketable securities consisted of the following as of December 31, 2015 and 2014 (in thousands):

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 obligation	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
December 31, 2014
Description	Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Cash	$	18,985	$	—	$	—		$	18,985
Cash equivalents:
Money market mutual funds	1,609		—		—			1,609
Total cash and cash equivalents	20,594		—		—			20,594
Short-term marketable securities:
Commercial paper	2,499		—		—			2,499
Corporate notes and bonds	53,643		—		(35		)	53,608
U.S. agency obligations	36,907		—		(13		)	36,894
Total short-term marketable securities	93,049		—		(48		)	93,001
Marketable securities, noncurrent:
Corporate notes and bonds	3,501		—		(4		)	3,497
Government obligations	1,995		1		—			1,996
U.S. agency obligations	2,049		—		—			2,049
Total marketable securities, noncurrent	7,545		1		(4		)	7,542
Cash, cash equivalents, short-term marketable securities and marketable securities, noncurrent	$	121,188	$	1	$	(52	)	$	121,137

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

As of December 31, 2015, 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	$	96,410
Due within 1 year through 3 years	6,429
Total marketable securities	$	102,839