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Financial Instruments - Cash Equivalents and Investments (Debt Securities) Classified as Available-for-sale Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 21,666	$ 46,851
Estimated Fair Value	21,666	46,851
Money Market Funds
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	21,666	44,347
Estimated Fair Value	21,666	44,347
Cash and Cash Equivalents
Schedule Of Available For Sale Securities [Line Items]
Estimated Fair Value	$ 21,666	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

X

- 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
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