Expected Credit Losses - Type of Customer Receivable (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Credit Loss [Abstract]
Accounts receivable and notes receivable, current	$ 3,322,000	$ 2,392,000
Contract assets, net	2,239,000	1,516,000
Long-term notes receivable, net of current portion	48,000	44,000
Other current liabilities	0	14,000
Total allowance for expected credit losses on customer receivables	$ 5,609,000	$ 3,966,000