Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Investments - Summary of Cash, Cash Equivalents and Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Cash and Cash Equivalents [Abstract]
Amortized Cost	$ 106,946	$ 85,586	$ 148,884	$ 69,649
Fair Value	106,946	85,586
Investments [Abstract]
Amortized Cost	162,977	158,307
Gross Unrealized Gains	10	2
Gross Unrealized Losses	(42)	(109)
Fair Value	162,945	158,200
Cash and money market accounts
Cash and Cash Equivalents [Abstract]
Amortized Cost	106,946	84,613
Fair Value	106,946	84,613
Certificates of deposit
Cash and Cash Equivalents [Abstract]
Amortized Cost		472
Fair Value		472
Corporate bonds
Cash and Cash Equivalents [Abstract]
Amortized Cost		501
Fair Value		501
Certificates of deposit (due within 1 year)
Investments [Abstract]
Amortized Cost	20,241	25,823
Gross Unrealized Gains	9	0
Gross Unrealized Losses	0	(9)
Fair Value	20,250	25,814
Certificates of deposit (due within 2 years)
Investments [Abstract]
Amortized Cost	3,840	4,429
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(1)	(3)
Fair Value	3,840	4,427
Commercial paper
Investments [Abstract]
Amortized Cost	4,477	5,988
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(2)	(3)
Fair Value	4,475	5,986
Corporate bonds (due within 1 year)
Investments [Abstract]
Amortized Cost	20,582	16,487
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(24)	(24)
Fair Value	20,558	16,463
Corporate bonds (due within 2 years)
Investments [Abstract]
Amortized Cost	3,882	13,912
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(15)	(64)
Fair Value	3,867	13,848
Government agencies (due within 1 year)
Investments [Abstract]
Amortized Cost	3,009	6,082
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(6)
Fair Value	3,009	6,076
Total investments
Investments [Abstract]
Amortized Cost	56,031	72,721
Gross Unrealized Gains	10	2
Gross Unrealized Losses	(42)	(109)
Fair Value	$ 55,999	$ 72,614