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Cash, Cash Equivalents, Restricted Cash and Marketable Securities - Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	$ 345,744	$ 165,005
Unrealized Gains	60	48
Unrealized Losses		(17)
Estimated Fair Value	345,804	165,036
Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	129,608	32,073
Estimated Fair Value	129,608	32,073
Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	216,136	132,932
Unrealized Gains	60	48
Unrealized Losses		(17)
Estimated Fair Value	216,196	132,963
Cash | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	17,008	7,945
Estimated Fair Value	17,008	7,945
Money Market Funds | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	112,600	23,128
Estimated Fair Value	112,600	23,128
U.S. Treasuries | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	23,347	32,548
Unrealized Gains	5	31
Estimated Fair Value	23,352	32,579
U.S. Government Agency Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	41,715	40,313
Unrealized Gains	10	14
Unrealized Losses		(6)
Estimated Fair Value	41,725	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	151,074	60,071
Unrealized Gains	45	3
Unrealized Losses		(11)
Estimated Fair Value	$ 151,119	$ 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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