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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, 2020	Dec. 31, 2019
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	$ 177,080	$ 150,983
Unrealized Gains	84	84
Unrealized Losses	(3)	(12)
Estimated Fair Value	177,161	151,055
Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	32,688	39,884
Estimated Fair Value	32,688	39,884
Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	144,392	111,099
Unrealized Gains	84	84
Unrealized Losses	(3)	(12)
Estimated Fair Value	144,473	111,171
Cash | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	2,998	4,038
Estimated Fair Value	2,998	4,038
Money Market Funds | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	25,138	27,854
Estimated Fair Value	25,138	27,854
Corporate Debt Securities | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	4,552	7,992
Estimated Fair Value	4,552	7,992
Corporate Debt Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	65,362	53,353
Unrealized Gains	22	28
Unrealized Losses	(1)
Estimated Fair Value	65,383	53,381
U.S. Treasuries | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	30,622	6,511
Unrealized Gains	51	6
Estimated Fair Value	30,673	6,517
U.S. Government Agency Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	48,408	51,235
Unrealized Gains	11	50
Unrealized Losses	(2)	(12)
Estimated Fair Value	$ 48,417	$ 51,273

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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=121645371&loc=d3e27161-111563

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