Operations and Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) Y segment	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Operations and Summary of Significant Accounting Policies
Number of operating segments | segment			2
Allowance for credit losses	$ 124,000		$ 124,000		$ 116,000
Warranty period			27 months
Warranty reserve	544,000		$ 544,000		581,000
Inventory reserve	636,000		636,000		602,000
Income taxes refunds received			0	$ 811,000
Income taxes paid			2,000	50,000
Interest paid			98,000	76,000
Impairment of long-lived assets			0		$ 0
ATG Research and development expenditures
Operations and Summary of Significant Accounting Policies
Research and Development Costs	$ 568,000		$ 1,470,000
Selling, general and administrative
Operations and Summary of Significant Accounting Policies
Research and Development Costs		$ 377,000		$ 1,029,000
Minimum
Operations and Summary of Significant Accounting Policies
Number of year's supply | Y			1
Period inventory is expected to be used			2 years