Property and Equipment (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	$ 126,648,000		$ 125,852,000
Less accumulated depreciation	(32,783,000)		(30,319,000)
Total property and equipment, net	93,865,000		95,533,000
Depreciation and amortization expense	2,464,000	$ 1,892,000	1,892,000
Machinery and equipment
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	56,278,000		55,528,000
Leasehold improvements
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	17,874,000		17,832,000
Vehicles
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	3,447,000		3,447,000
Furniture and fixtures
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	855,000		851,000
Building
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	34,134,000		34,134,000
Land
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	11,907,000		11,907,000
Property held under capital leases
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	1,607,000		1,607,000
Computer hardware and software
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	$ 546,000		$ 546,000