Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Intangible assets and goodwill	$ 1,390	$ 1,682
Inventories and related reserves	13,216	12,151
Deferred revenue and cost of goods sold	4,652	4,652
Other accruals and reserves	4,337	2,799
Accrued compensation	9,221	8,317
Allowance for doubtful accounts	971	2,346
Net operating loss and tax credit carryforwards	44,230	52,664
Lease liabilities	6,268
Other, net	1,567	2,200
Total	85,852	86,811
Valuation allowance	(38,741)	(49,014)
Deferred tax asset	47,111	37,797
Withholding taxes	40
Property, plant and equipment	(5,881)	(4,569)
Right-of-use lease assets	(6,073)
Deferred tax liability	(11,994)	(4,569)
Net deferred tax assets	$ 35,117	$ 33,228