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Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	$ 140,386	$ 145,604
Unrealized Gains	108
Unrealized Losses		(68)
Estimated Fair Value	140,494	145,536
Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	34,225	49,348
Estimated Fair Value	34,225	49,348
Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	106,161	96,256
Unrealized Gains	108
Unrealized Losses		(68)
Estimated Fair Value	106,269	96,188
Cash | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	2,384	3,147
Estimated Fair Value	2,384	3,147
Money Market Funds | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	29,343	44,002
Estimated Fair Value	29,343	44,002
U.S. Treasuries | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	500
Estimated Fair Value	500
U.S. Treasuries | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	1,493	14,732
Unrealized Gains	1
Unrealized Losses		(8)
Estimated Fair Value	1,494	14,724
Corporate Debt Securities | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	1,998	2,199
Estimated Fair Value	1,998	2,199
Corporate Debt Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	77,794	39,108
Unrealized Gains	78
Unrealized Losses		(16)
Estimated Fair Value	77,872	39,092
U.S. Government Agency Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	26,874	42,416
Unrealized Gains	29
Unrealized Losses		(44)
Estimated Fair Value	$ 26,903	$ 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=118939692&loc=d3e27161-111563

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