Balance Sheet Components - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Inventory, finished goods, gross	$ 20,400		$ 20,400		$ 15,600
Inventory, work in process, gross	1,900		1,900		1,700
Property and equipment, gross	30,399		30,399		$ 25,771
Depreciation expense	1,500	$ 900	3,900	$ 2,400
Construction in progress, surgical placement instrument set
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,400		3,400
Construction in Progress, Santa Clara Lease
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 100		$ 100