Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Intangible assets and goodwill	$ 2,475	$ 1,390
Inventories and related reserves	17,585	13,216
Deferred revenue and cost of goods sold	4,035	4,652
Other accruals and reserves	4,061	4,337
Accrued compensation	8,734	9,221
Provision for expected credit losses	1,178	971
Net operating loss and tax credit carryforwards	42,569	44,230
Lease liabilities	6,033	6,268
Other, net	500	1,567
Total	87,170	85,852
Valuation allowance	(50,496)	(38,741)
Deferred tax asset	36,674	47,111
Withholding taxes	40	40
Property, plant and equipment	(5,975)	(5,881)
Right-of-use lease assets	(5,617)	(6,073)
Deferred tax liability	(11,632)	(11,994)
Net deferred tax assets	$ 25,042	$ 35,117