Quarterly report pursuant to Section 13 or 15(d)

INTANGIBLE ASSETS, NET

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INTANGIBLE ASSETS, NET
 3 Months Ended
Mar. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
INTANGIBLE ASSETS, NET INTANGIBLE ASSETS, NETIntangible assets were recorded in relation to the acquisition of TC on October 1, 2014.
The following tables summarize the gross carrying amounts and accumulated amortization of intangible assets by major class:
  March 31, 2022
Gross Accumulated Amortization Net
(thousands of dollars)
Customer relationships $ 16,852  $ (8,426) $ 8,426 
Non-compete agreements 94  (94) — 
Licenses and permits 1,471  (829) 642 
Developed technology 6,131  (4,598) 1,533 
Total $ 24,548  $ (13,947) $ 10,601 
  December 31, 2021
Gross Accumulated Amortization Net
(thousands of dollars)
Customer relationships $ 16,852  $ (8,145) $ 8,707 
Non-compete agreements 94  (94) — 
Licenses and permits 1,471  (808) 663 
Developed technology 6,131  (4,445) 1,686 
Total $ 24,548  $ (13,492) $ 11,056 
Amortization expense for intangible assets included in cost of sales was approximately $0.5 million and $0.5 million for the three months ended March 31, 2022 and 2021, respectively.
Based on identified intangible assets that are subject to amortization as of March 31, 2022, we expect future amortization expenses for each period to be as follows:
Total Remainder of 2022 2023 2024 2025 2026 2027 Thereafter
(thousands of dollars)
Customer relationships $ 8,426  $ 843  $ 1,123  $ 1,123  1,123  1,123  1,123  $ 1,968 
Licenses and permits 642  64  86  86  86  86  86  148 
Developed technology 1,533  460  613  460  —  —  —  — 
Total future amortization expense $ 10,601  $ 1,367  $ 1,822  $ 1,669  $ 1,209  $ 1,209  $ 1,209  $ 2,116