Investments - Summary of Available For Sale Securities Amortized Cost Gross Unrealized Gains Losses and Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, Amortized Cost	$ 78,948	$ 19,068
Available-for-sale securities, Gross Unrealized Loss	(288)	(40)
Available-for-sale securities, Estimated Fair Value	78,660	19,028
Certificates of deposit [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, Amortized Cost	3,920	3,922
Available-for-sale securities, Gross Unrealized Loss	(12)	(4)
Available-for-sale securities, Estimated Fair Value	3,908	3,918
U.S. Treasury bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, Amortized Cost	75,028	15,146
Available-for-sale securities, Gross Unrealized Loss	(276)	(36)
Available-for-sale securities, Estimated Fair Value	$ 74,752	$ 15,110

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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