Business Description and Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2023 USD ($) Y	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Business Description and Summary of Significant Accounting Policies
Allowance for doubtful accounts	$ 125,000		$ 135,000
Warranty period	27 months
Warranty reserve	$ 594,000		581,000
Inventory reserve	1,083,000		1,258,000
Income taxes paid or refunded	0
Income taxes refunded/paid		$ 113,000
Interest paid	5,000	31,000
Impairment of long-lived assets	0		$ 0
ATG Research and development expenditures
Business Description and Summary of Significant Accounting Policies
Research and Development Costs	$ 395,000
Selling, general and administrative
Business Description and Summary of Significant Accounting Policies
Research and Development Costs		$ 319,000
Minimum
Business Description and Summary of Significant Accounting Policies
Number of year's supply | Y	1
Period inventory is expected to be used	2 years