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Cash, Cash Equivalents, Restricted Cash and Marketable Securities - Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	$ 174,909	$ 145,604
Unrealized Gains	67
Unrealized Losses	(30)	(68)
Estimated Fair Value	174,946	145,536
Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	37,297	49,348
Estimated Fair Value	37,297	49,348
Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	137,612	96,256
Unrealized Gains	67
Unrealized Losses	(30)	(68)
Estimated Fair Value	137,649	96,188
Cash | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	3,565	3,147
Estimated Fair Value	3,565	3,147
Money Market Funds | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	33,732	44,002
Estimated Fair Value	33,732	44,002
U.S. Treasuries | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	1,495	14,732
Unrealized Gains	2
Unrealized Losses		(8)
Estimated Fair Value	1,497	14,724
U.S. Government Agency Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	58,718	42,416
Unrealized Gains	23
Unrealized Losses	(22)	(44)
Estimated Fair Value	58,719	42,372
Corporate Debt Securities | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost		2,199
Estimated Fair Value		2,199
Corporate Debt Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	77,399	39,108
Unrealized Gains	42
Unrealized Losses	(8)	(16)
Estimated Fair Value	$ 77,433	$ 39,092

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Cash, cash equivalents and marketable securities

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- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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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