Business Description And Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) reporting_unit	Dec. 31, 2020 USD ($)
Business Description And Significant Accounting Policies [Line Items]
Cash held in foreign accounts	$ 588,000	$ 672,000
Number of reporting units | reporting_unit	1
Goodwill impairment	$ 0	0
Maximum period in which accounts receivable become due	150 days
Recognized foreign currency transactions gain (loss)	$ (11,000)	27,000
Advertising expense	$ 252,000	371,000
Minimum [Member]
Business Description And Significant Accounting Policies [Line Items]
Trade notes receivable interest rate stated percentage	5.00%
Trade notes receivable repayment period	18 months
Estimated useful lives of the equipment and leasehold improvements (in years)	1 year
Warranty period	1 year
Warranty period (in years)	1 year
Maximum [Member]
Business Description And Significant Accounting Policies [Line Items]
Trade notes receivable interest rate stated percentage	7.00%
Trade notes receivable repayment period	36 months
Estimated useful lives of the equipment and leasehold improvements (in years)	7 years
Warranty period	3 years
Warranty period (in years)	3 years
Leasehold Improvements [Member] | Minimum [Member]
Business Description And Significant Accounting Policies [Line Items]
Estimated useful lives of the equipment and leasehold improvements (in years)	1 year
Leasehold Improvements [Member] | Maximum [Member]
Business Description And Significant Accounting Policies [Line Items]
Estimated useful lives of the equipment and leasehold improvements (in years)	8 years
Affiliated Entity [Member]
Business Description And Significant Accounting Policies [Line Items]
Sales to related party	$ 387,000	40,000
Cumulative purchases	61,000	59,000
Accounts receivable due from related party sales	$ 185,000	$ 3,000