Business Segments - Additional Information (Details)	3 Months Ended
	Mar. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment	2
Total identifiable assets	$ 51,928,000	$ 50,093,000
Operating Segments
Segment Reporting Information [Line Items]
Total identifiable assets	51,928,000	50,093,000
Operating Segments | ATG
Segment Reporting Information [Line Items]
Total identifiable assets	42,382,000	40,871,000
Operating Segments | CPG
Segment Reporting Information [Line Items]
Total identifiable assets	$ 9,546,000	$ 9,222,000