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Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	$ 216,127	$ 191,934
Unrealized Gains	7
Unrealized Losses	(91)	(80)
Estimated Fair Value	216,043	191,854
Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	28,726	26,584
Estimated Fair Value	28,726	26,584
Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	187,401	165,350
Unrealized Gains	7
Unrealized Losses	(91)	(80)
Estimated Fair Value	187,317	165,270
Cash | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	3,313	4,041
Estimated Fair Value	3,313	4,041
Money Market Funds | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	25,413	22,543
Estimated Fair Value	25,413	22,543
U.S. Treasuries | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	37,131	45,559
Unrealized Losses	(12)	(25)
Estimated Fair Value	37,119	45,534
U.S. Government Agency Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	45,230	86,860
Unrealized Losses	(52)	(40)
Estimated Fair Value	45,178	86,820
Corporate Debt Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	105,040	32,931
Unrealized Gains	7
Unrealized Losses	(27)	(15)
Estimated Fair Value	$ 105,020	$ 32,916

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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