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Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	$ 183,216	$ 145,604
Unrealized Gains	10
Unrealized Losses	(10)	(68)
Estimated Fair Value	183,216	145,536
Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	112,133	49,348
Estimated Fair Value	112,133	49,348
Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	71,083	96,256
Unrealized Gains	10
Unrealized Losses	(10)	(68)
Estimated Fair Value	71,083	96,188
Cash | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	1,518	3,147
Estimated Fair Value	1,518	3,147
Money Market Funds | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	102,616	44,002
Estimated Fair Value	102,616	44,002
U.S. Treasuries | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	5,000
Estimated Fair Value	5,000
U.S. Treasuries | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	1,999	14,732
Unrealized Losses		(8)
Estimated Fair Value	1,999	14,724
Corporate Debt Securities | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	2,999	2,199
Estimated Fair Value	2,999	2,199
Corporate Debt Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	42,999	39,108
Unrealized Gains	10
Unrealized Losses	(2)	(16)
Estimated Fair Value	43,007	39,092
U.S. Government Agency Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	26,085	42,416
Unrealized Losses	(8)	(44)
Estimated Fair Value	$ 26,077	$ 42,372

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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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