Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Summary of Significant Accounting Policies

Schedule of useful life of property, plant and equipment

	Useful Life
Systems and related equipment	Up to 15 years
Machinery and equipment	3-10 years
Furniture and fixtures	5 years
Computer hardware and software	3-10 years
Vehicles	5 years
Transloading facility and equipment	15-30 years
Buildings and leasehold improvements	15 years

Schedule of intangible assets by major classification

			Accumulated		Net Book
	Gross		Amortization		Value
As of December 31, 2020:
Customer relationships	$	4,703	$	(2,072)	$	2,631
Software acquired in the acquisition of Railtronix		346		(152)		194
Non-competition agreement		225		(139)		86
Patents and other		114		(43)		71
Total identifiable intangibles	$	5,388	$	(2,406)	$	2,982
As of December 31, 2019:
Customer relationships	$	4,703	$	(1,400)	$	3,303
Software acquired in the acquisition of Railtronix		346		(103)		243
Non-competition agreement		225		(94)		131
Patents and other		114		(30)		84
Total identifiable intangibles	$	5,388	$	(1,627)	$	3,761