Revenue from Contracts with Customers - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Disaggregation Of Revenue [Line Items]
Order shipments, description			A majority of the Company’s revenue is short cycle in nature with shipments within one year from order.
Payment terms, description			The Company's payment terms generally range between 30 to 90 days.
Refund liability related to estimated sales returns	$ 109,000		$ 109,000		$ 147,000
Contract assets	0		0		0
Contract with customer liability, revenue recognized	200,000	$ 100,000	600,000	$ 400,000
Accrued Liabilities [Member]
Disaggregation Of Revenue [Line Items]
Refund liability related to estimated sales returns	100,000		100,000		100,000
Contract liability	400,000		400,000		200,000
Inventories [Member]
Disaggregation Of Revenue [Line Items]
Product return asset	$ 100,000		$ 100,000		$ 100,000