Balance Sheet Components - Summary of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 12,010	$ 5,588
Less: accumulated depreciation and amortization	(3,269)	(2,739)
Property and equipment, net	8,741	2,849
Furniture and Fixtures and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	180	180
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	4,328	126
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	673	274
Capitalized Surgical Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	6,083	4,442
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	340	160
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	268	268
Software [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 138	$ 138