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Cash, Cash Equivalents, Restricted Cash and Marketable Securities - Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	$ 150,983	$ 145,604
Unrealized Gains	84
Unrealized Losses	(12)	(68)
Estimated Fair Value	151,055	145,536
Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	39,884	49,348
Estimated Fair Value	39,884	49,348
Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	111,099	96,256
Unrealized Gains	84
Unrealized Losses	(12)	(68)
Estimated Fair Value	111,171	96,188
Cash | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	4,038	3,147
Estimated Fair Value	4,038	3,147
Money Market Funds | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	27,854	44,002
Estimated Fair Value	27,854	44,002
Corporate Debt Securities | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	7,992	2,199
Estimated Fair Value	7,992	2,199
Corporate Debt Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	53,353	39,108
Unrealized Gains	28
Unrealized Losses		(16)
Estimated Fair Value	53,381	39,092
U.S. Treasuries | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	6,511	14,732
Unrealized Gains	6
Unrealized Losses		(8)
Estimated Fair Value	6,517	14,724
U.S. Government Agency Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	51,235	42,416
Unrealized Gains	50
Unrealized Losses	(12)	(44)
Estimated Fair Value	$ 51,273	$ 42,372

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Cash, cash equivalents and marketable securities

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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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