Balance Sheet Components - Summary of Property and Equipment, Net (Detail) - USD ($) $ in Thousands		Sep. 30, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Total property and equipment		$ 39,222	$ 31,046
Less: accumulated depreciation and amortization		(14,054)	(8,748)
Property and equipment, net		25,168	22,298
Furniture And Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment		2,565	2,494
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment		686	1,115
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment		3,052	2,423
Capitalized Surgical Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	[1]	20,878	14,253
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment		1,115	1,020
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment		10,244	9,425
Software and Website Development [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment		$ 682	$ 316

[1] 1 Capitalized surgical equipment includes $16.6 million and $12.2 million that is ready for its intended use and have started depreciating and $4.3 million and $2.1 million that is not ready for its intended use and have not started depreciation as of September 30, 2024 and December 31, 2023, respectively.