Income Taxes - Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Accounts receivable	$ 87	$ 247
Inventory	6,517	4,085
Accruals not currently deductible for tax purposes	7,568	8,694
Net operating loss and credit carryforwards	22,316	15,878
Capital loss carryforward	0	2,450
Equity compensation	3,415	3,054
Asset impairments	452	452
Other, net	5,990	3,488
Gross deferred tax assets	46,345	38,348
Valuation allowance	(20,118)	(18,079)
Total deferred tax assets	26,227	20,269
Purchased intangible assets	(44,447)	(50,128)
Depreciation	(6,491)	(3,874)
Gross deferred tax liabilities	(50,938)	(54,002)
Total deferred tax liabilities	$ (24,711)	$ (33,733)