Intangible Assets

9 Months Ended

Sep. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

Intangible Assets

Intangible assets consist of the following:

	September 30, 2020
	Gross Carrying Amount		Accumulated Amortization		Net		Remaining Useful Life (Years)
Disposal permits	$	540	$	(326)	$	214	4.9
Trade name	799		(710)		89		0.3
Total intangible assets	$	1,339	$	(1,036)	$	303	3.5

	December 31, 2019
	Gross Carrying Amount		Accumulated Amortization		Net		Remaining Useful Life (Years)
Disposal permits	$	554	$	(269)	$	285	5.0
Trade name	799		(444)		355		1.0
Total intangible assets	$	1,353	$	(713)	$	640	2.8

The disposal permits are related to the Rocky Mountain, Northeast and Southern divisions. The remaining weighted average useful lives shown are calculated based on the net book value and remaining amortization period of each respective intangible asset.

Amortization expense was $0.1 million and $0.1 million for the three months ended September 30, 2020 and September 30, 2019, respectively, and $0.3 million and $0.3 million for the nine months ended September 30, 2020 and September 30, 2019, respectively.