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Intangible Assets | 9 Months Ended
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Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets Gross carrying amounts and accumulated amortization of finite-lived intangible assets by major class were as follows:
| September 30, 2020 |  |  |  |  |  | December 31, 2019 |  |  |  |
| Gross |  | Accumulated amortization |  | Net |  | Gross |  | Accumulated amortization |  | Net
Customer relationships | $ | 1,605 |  |  | $ | (421) |  |  | $ | 1,184 |  |  | $ | 1,621 |  |  | $ | (331) |  |  | $ | 1,290 |
Trade names | 553 |  |  | (58) |  |  | 495 |  |  | 541 |  |  | (40) |  |  | 501 |
Technology | 162 |  |  | (60) |  |  | 102 |  |  | 158 |  |  | (41) |  |  | 117 |
Long term supply contracts | 126 |  |  | (47) |  |  | 79 |  |  | 150 |  |  | (48) |  |  | 102 |
Patents | 14 |  |  | (10) |  |  | 4 |  |  | 14 |  |  | (9) |  |  | 5 |
| $ | 2,460 |  |  | $ | (596) |  |  | $ | 1,864 |  |  | $ | 2,484 |  |  | $ | (469) |  |  | $ | 2,015 |
Total amortization expense of intangible assets for the three and nine months ended September 30, 2020 and 2019 was $45 and $134 and $43 and $140.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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