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Intangible Assets | 6 Months Ended
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Jun. 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:
| June 30, 2020 |  |  |  |  |  | December 31, 2019 |  |  |  |
| Gross |  | Accumulated amortization |  | Net |  | Gross |  | Accumulated amortization |  | Net
Customer relationships | $ | 1,573 |  |  | $ | (385) |  |  | $ | 1,188 |  |  | $ | 1,621 |  |  | $ | (331) |  |  | $ | 1,290 |
Trade names | 541 |  |  | (51) |  |  | 490 |  |  | 541 |  |  | (40) |  |  | 501 |
Technology | 158 |  |  | (53) |  |  | 105 |  |  | 158 |  |  | (41) |  |  | 117 |
Long term supply contracts | 123 |  |  | (40) |  |  | 83 |  |  | 150 |  |  | (48) |  |  | 102 |
Patents | 15 |  |  | (9) |  |  | 6 |  |  | 14 |  |  | (9) |  |  | 5 |
| $ | 2,410 |  |  | $ | (538) |  |  | $ | 1,872 |  |  | $ | 2,484 |  |  | $ | (469) |  |  | $ | 2,015 |
Total amortization expense of intangible assets for the three and six months ended June 30, 2020 and 2019 was $44 and $89 and $47 and $94.

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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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