Business and Geographic Information - Geographical Information Attributable to Net Sales (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	$ 29,600	$ 29,700	$ 33,700	$ 31,200	$ 27,400	$ 30,000	$ 32,400	$ 28,400	$ 124,243	$ 118,217	$ 112,035
Point of destination
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales									124,243	118,217	112,035
United States | Point of destination
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales									114,186	108,773	103,646
Canada | Point of destination
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales									7,257	6,436	5,353
Mexico | Point of destination
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales									922	1,438	1,486
Other | Point of destination
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales									$ 1,878	$ 1,570	$ 1,550