Marketable Securities and Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2015

Fair Value Disclosures [Abstract]

Schedule of Marketable Securities

The following table presents details of the Company’s marketable securities as of September 30, 2015 (in thousands):

	September 30, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term:
Investment securities	$	16,646	$	9	$	(1	)	$	16,654
Long-term:
Investment securities	74,535		55		(130		)	74,460
Total	$	91,181	$	64	$	(131	)	$	91,114

Schedule of the Fair Value of the Company's Financial Assets Measured at Fair Value on a Recurring Basis Based on the Three-Tier Value Hierarchy

The following tables set forth the fair value of the Company’s financial assets measured at fair value on a recurring basis as of September 30, 2015 and December 31, 2014 based on the three-tier value hierarchy (in thousands):

	September 30, 2015
	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market funds	$	182,227	$	—	$	—	$	182,227
Short-term investments:
Certificates of deposit	30,000		—		—		30,000
Investment securities	—		16,654		—		16,654
Long-term:
Investment securities	—		74,460		—		74,460
Total	$	212,227	$	91,114	$	—	$	303,341

	December 31, 2014
	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market funds	$	302,595	$	—	$	—	$	302,595
Short-term investments:
Certificates of deposit	60,000		—		—		60,000
Restricted cash:
Money market funds	302		—		—		302
Total	$	362,897	$	—	$	—	$	362,897