Property, Plant, and equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019	Dec. 31, 2018
Property, Plant, and Equipment
Property, plant and equipment, gross	$ 41,577			$ 40,449
Less accumulated depreciation	(14,766)			(13,114)
Property, Plant and Equipment, Net, Total	26,811		$ 27,335	27,335
Depreciation and amortization expense	1,653	$ 1,250
Leasehold improvements
Property, Plant, and Equipment
Property, plant and equipment, gross	10,906			10,776
Equipment
Property, Plant, and Equipment
Property, plant and equipment, gross	14,782			14,477
Vehicles and accessories
Property, Plant, and Equipment
Property, plant and equipment, gross	4,004			3,989
Computer equipment and software
Property, Plant, and Equipment
Property, plant and equipment, gross	6,131			5,839
Buildings
Property, Plant, and Equipment
Property, plant and equipment, gross	2,480			2,479
Furniture and fixtures
Property, Plant, and Equipment
Property, plant and equipment, gross	1,573			1,547
Land
Property, Plant, and Equipment
Property, plant and equipment, gross	660			660
Construction in Progress
Property, Plant, and Equipment
Property, plant and equipment, gross	$ 1,041			$ 682