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Income Taxes (Deferred Tax Assets (Liabilities)) (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Abstract]
Reserves on inventory and sales	$ 745	$ 647
Credit and loss carryforwards	1,269	681
Stock compensation	756	812
Accrued expenses and deferred costs	2,639	2,473
Inventory capitalization	307	275
Unrealized loss on investments	(10)
Unrealized gain on investments		65
Total deferred tax assets	5,716	4,953
Prepaid expenses	(1,034)	(774)
Depreciation	(3,365)	(1,199)
Total deferred tax liabilities	(4,409)	(1,973)
Net deferred tax asset	$ 1,307	$ 2,980

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