Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) Segment	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of reportable segment | Segment			1
Number of operating segment | Segment			1
Net of an allowance for doubtful accounts	$ 300		$ 300		$ 400
Recovery (provision) for bad debts	0	$ 200	72	$ (228)
Provision for inventory obsolescence			88	412
Proceeds from IPO used for offering costs			2,300
Deferred offering costs	0		0		$ 200
Obsolescence [Member]
Summary Of Significant Accounting Policies [Line Items]
Provision for inventory obsolescence	100	$ 100	$ 100	$ 400
Capitalized Surgical Instruments [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful life of its capitalized instruments			3 years
Minimum [Member] | Capitalized Surgical Instruments [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful life of its capitalized instruments			18 months
Decrease in depreciation expense	$ 100		$ 100
Maximum [Member] | Revenue Benchmark [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	10.00%	10.00%	10.00%	10.00%
Maximum [Member] | Accounts Receivable [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage			10.00%		10.00%
Maximum [Member] | Capitalized Surgical Instruments [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful life of its capitalized instruments			36 months
Decrease in depreciation expense			$ 200