Balance Sheet Components - Summary of Available-For-Sale Marketable Securities (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2026	Dec. 31, 2025
Marketable Securities [Line Items]
Amortized Cost	$ 32,146	$ 37,587
Gross Unrealized Gains	1	73
Gross Unrealized Losses	(109)	(1)
Fair Value	32,038	37,659
U.S. Treasury and Government Agencies [Member]
Marketable Securities [Line Items]
Amortized Cost	6,015	6,709
Gross Unrealized Gains	0	9
Gross Unrealized Losses	(22)	0
Fair Value	5,993	6,718
Commercial Paper [Member]
Marketable Securities [Line Items]
Amortized Cost	0
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	0
Corporate Debt [Member]
Marketable Securities [Line Items]
Amortized Cost	16,761	19,254
Gross Unrealized Gains	1	48
Gross Unrealized Losses	(55)	0
Fair Value	16,707	19,302
Asset-Backed Securities [Member]
Marketable Securities [Line Items]
Amortized Cost	7,570	10,423
Gross Unrealized Gains	0	16
Gross Unrealized Losses	(32)	(1)
Fair Value	7,538	10,438
Yankee CD [Member]
Marketable Securities [Line Items]
Amortized Cost	1,800	1,201
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 1,800	$ 1,201

Amortized cost of 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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