Plant, Equipment, Leasehold Improvements and Operating Lease Right-of-Use Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Plant, Equipment and Leasehold Improvements
Plant, equipment and leasehold improvements, gross	$ 129,489,000	$ 119,100,000
Less accumulated depreciation and amortization	(66,436,000)	(61,922,000)
Total property, equipment and leasehold improvements, net	63,053,000	57,178,000
Impairments of the Company's plant, equipment, and leasehold improvement assets	0	0
Machinery and equipment
Plant, Equipment and Leasehold Improvements
Plant, equipment and leasehold improvements, gross	67,506,000	64,786,000
Machinery and equipment under financing leases
Plant, Equipment and Leasehold Improvements
Plant, equipment and leasehold improvements, gross	23,774,000	15,717,000
Furniture, fixtures and computer equipment
Plant, Equipment and Leasehold Improvements
Plant, equipment and leasehold improvements, gross	107,000	3,072,000
Leasehold improvements
Plant, Equipment and Leasehold Improvements
Plant, equipment and leasehold improvements, gross	16,335,000	14,703,000
Construction in progress
Plant, Equipment and Leasehold Improvements
Plant, equipment and leasehold improvements, gross	1,778,000	3,304,000
Operating lease right-of-use assets
Plant, Equipment and Leasehold Improvements
Plant, equipment and leasehold improvements, gross	$ 19,989,000	$ 17,518,000