Income Taxes - Summary of Deferred Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Gross deferred tax assets
Net operating loss carryforward – U.S.	$ 24,738	$ 36,071
Net operating loss carryforward – Switzerland	162	106
Research and development tax credit carryforward	5,836	5,418
Deferred revenue	14	219
Stock-based compensation	3,423	2,954
Inventory reserve	56	159
Compensation accruals	1,426	1,304
Product reserves	5,235	2,820
Operating lease liabilities	1,436	1,546
Amortization	64	607
Other	188	145
Total deferred tax assets	42,578	51,349
Deferred tax liabilities
Depreciation	(1,753)	(1,838)
Operating lease right-of-use asset	(1,048)	(1,303)
Installment sale	(5,580)	0
Total deferred tax liabilities	(8,381)	(3,141)
Net deferred tax asset before valuation allowance	34,197	48,208
Less: Valuation allowance	(1,154)	(1,226)
Net deferred tax asset	$ 33,043	$ 46,982