Income Taxes - Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Accounts receivable	$ 436	$ 87
Inventory	4,566	6,517
Accruals not currently deductible for tax purposes	12,828	7,568
Net operating loss and credit carryforwards	33,347	22,316
Equity compensation	3,001	3,415
Asset impairments	452	452
Other, net	6,212	5,990
Gross deferred tax assets	60,842	46,345
Valuation allowance	(29,399)	(20,118)
Total deferred tax assets	31,443	26,227
Purchased intangible assets	(38,083)	(44,447)
Depreciation	(13,276)	(6,491)
Gross deferred tax liabilities	(51,359)	(50,938)
Total deferred tax liabilities	$ (19,916)	$ (24,711)