Revenue from Contracts with Customers - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	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 purchase order.
Payment terms, description	The Company's payment terms generally range between 30 to 90 days.
Refund liability	$ 146,000	$ 147,000
Contract assets	0	0
Contract with customer liability, revenue recognized	800,000	600,000
Accrued Liabilities [Member]
Disaggregation Of Revenue [Line Items]
Refund liability	100,000	100,000
Contract liability	400,000	400,000
Inventories [Member]
Disaggregation Of Revenue [Line Items]
Product return asset	$ 100,000	$ 100,000