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Cash, Cash Equivalents, Restricted Cash and Marketable Securities - Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	$ 232,652	$ 165,005
Unrealized Gains	42	48
Unrealized Losses	(20)	(17)
Estimated Fair Value	232,674	165,036
Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	79,055	32,073
Estimated Fair Value	79,055	32,073
Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	153,597	132,932
Unrealized Gains	42	48
Unrealized Losses	(20)	(17)
Estimated Fair Value	153,619	132,963
Cash | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	7,681	7,945
Estimated Fair Value	7,681	7,945
Money Market Funds | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	71,374	23,128
Estimated Fair Value	71,374	23,128
U.S. Treasuries | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	28,448	32,548
Unrealized Gains	17	31
Estimated Fair Value	28,465	32,579
U.S. Government Agency Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	47,462	40,313
Unrealized Gains	17	14
Unrealized Losses	(7)	(6)
Estimated Fair Value	47,472	40,321
Corporate Debt Securities | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost		1,000
Estimated Fair Value		1,000
Corporate Debt Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	77,687	60,071
Unrealized Gains	8	3
Unrealized Losses	(13)	(11)
Estimated Fair Value	$ 77,682	$ 60,063

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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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