Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of inventories

Inventories consisted of the following as of December 31, 2020 and 2021 (in thousands):

	2020		2021
Raw materials and spare parts	$	28,100	$	31,302
Total inventory	$	28,100	$	31,302

Schedule of finite-lived intangible assets

The Company’s intangible assets as of December 31, 2020 and 2021 were as follows (in thousands):

	2020		2021
Customer relationships	$	5,376	$	5,376
Acquired contracts		4,384		9,884
Trademark and trade names		2,700		2,700
Non-compete agreements		860		860
Total intangible assets		13,320		18,820
Less accumulated amortization		(12,856)		(13,320)
Net intangible assets	$	464	$	5,500

Schedule of goodwill

The following table summarizes the activity related to the carrying amount of goodwill (in thousands):

Balance as of December 31, 2019	$	64,328
Balance as of December 31, 2020	$	64,328
Balance as of December 31, 2021	$	64,328