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Financial Instruments - Cash Equivalents and Short-Term Investments Classified as Available-for-sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 23,090	$ 46,851
Estimated Fair Value	23,090	46,851
Money Market Funds (Cash Equivalents)
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	23,090	44,347
Estimated Fair Value	23,090	44,347
Cash and Cash Equivalents
Schedule Of Available For Sale Securities [Line Items]
Estimated Fair Value	$ 23,090	44,347
U.S. Government Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		2,504
Estimated Fair Value		2,504
Short-Term Investments
Schedule Of Available For Sale Securities [Line Items]
Estimated Fair Value		$ 2,504

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- Definition

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)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
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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
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