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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, 2020	Dec. 31, 2019
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	$ 165,005	$ 150,983
Unrealized Gains	48	84
Unrealized Losses	(17)	(12)
Estimated Fair Value	165,036	151,055
Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	32,073	39,884
Estimated Fair Value	32,073	39,884
Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	132,932	111,099
Unrealized Gains	48	84
Unrealized Losses	(17)	(12)
Estimated Fair Value	132,963	111,171
Cash | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	7,945	4,038
Estimated Fair Value	7,945	4,038
Money Market Funds | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	23,128	27,854
Estimated Fair Value	23,128	27,854
Corporate Debt Securities | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	1,000	7,992
Estimated Fair Value	1,000	7,992
Corporate Debt Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	60,071	53,353
Unrealized Gains	3	28
Unrealized Losses	(11)
Estimated Fair Value	60,063	53,381
U.S. Treasuries | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	32,548	6,511
Unrealized Gains	31	6
Estimated Fair Value	32,579	6,517
U.S. Government Agency Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	40,313	51,235
Unrealized Gains	14	50
Unrealized Losses	(6)	(12)
Estimated Fair Value	$ 40,321	$ 51,273

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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=121645371&loc=d3e27161-111563

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