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Significant Accounting Policies and New Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Line Items]
Statutory limit of highly liquid investments		$ 250		$ 250
Cash - restricted		236		236		$ 240
Allowance for bad debt		2,600		2,600		2,600
Depreciation Expense		545	$ 515	1,096	$ 1,013
Write down of goodwill					6,585
Accrued warranties		1,578	1,423	1,578	1,423	$ 1,292	$ 1,604
Research and development costs		800	771	1,585	1,458
Advertising costs		146	69	$ 274	234
Maximum [Member] \| Argentina [Member] \| PM Argentina [Member] \| Sales Revenue, Net [Member] \| Customer Concentration Risk [Member]
Accounting Policies [Line Items]
Net sales in percentage as compared to consolidated net sales				5.00%		5.00%
Paycheck Protection Program [Member]
Accounting Policies [Line Items]
Debt instrument, payment terms				two-year term
Debt instrument, interest rate during period				1.00%
Debt instrument, periodic payment, principal				$ 0
Debt instrument frequency of periodic payment				18
Proceeds from bank debt				$ 3,700
Paycheck Protection Program [Member] \| Loans Payable [Member]
Accounting Policies [Line Items]
Proceeds from Issuance of Debt	$ 3,700
Goodwill [Member]
Accounting Policies [Line Items]
Write down of goodwill		0	0	0	6,600
Trade Names [Member]
Accounting Policies [Line Items]
Impairment charges		$ 0	$ 0	$ 0	$ 100