Operations and Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) Y	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Operations and Summary of Significant Accounting Policies
Allowance for doubtful accounts	$ 91,000		$ 91,000		$ 116,000
Warranty period			27 months
Warranty reserve	579,000		$ 579,000		581,000
Inventory reserve	616,000		616,000		602,000
Income taxes paid or refunded			0	$ 811,000
Income taxes refunded/paid			2,000	50,000
Interest paid			46,000	66,000
Impairment of long-lived assets			0		$ 0
ATG Research and development expenditures
Operations and Summary of Significant Accounting Policies
Research and Development Costs	$ 507,000		$ 902,000
Selling, general and administrative
Operations and Summary of Significant Accounting Policies
Research and Development Costs		$ 333,000		$ 652,000
Minimum
Operations and Summary of Significant Accounting Policies
Number of year's supply | Y			1
Period inventory is expected to be used			2 years