Revenue from Contracts with Customers - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
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	$ 205,000		$ 146,000
Contract assets	0		0
Contract with customer liability, revenue recognized	500,000	$ 400,000
Accrued Liabilities [Member]
Disaggregation Of Revenue [Line Items]
Refund liability	200,000		100,000
Contract liability	500,000		400,000
Inventories [Member]
Disaggregation Of Revenue [Line Items]
Product return asset	$ 100,000		$ 100,000