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Intangible Assets | 3 Months Ended
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Mar. 31, 2019
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:
| March 31, 2019 |  | December 31, 2018
| Gross |  | Accumulated amortization |  | Net |  | Gross |  | Accumulated amortization |  | Net
Customer relationships | $ | 1,607 |  |  | $ | (236 | ) |  | $ | 1,371 |  |  | $ | 1,615 |  |  | $ | (206 | ) |  | $ | 1,409 |
Trade names | 541 |  |  | (23 | ) |  | 518 |  |  | 547 |  |  | (17 | ) |  | 530 |
Technology | 158 |  |  | (23 | ) |  | 135 |  |  | 160 |  |  | (18 | ) |  | 142 |
Long term supply contracts | 146 |  |  | (40 | ) |  | 106 |  |  | 143 |  |  | (37 | ) |  | 106 |
Patents | $ | 14 |  |  | $ | (8 | ) |  | $ | 6 |  |  | $ | 14 |  |  | $ | (8 | ) |  | $ | 6 |
| $ | 2,466 |  |  | $ | (330 | ) |  | $ | 2,136 |  |  | $ | 2,479 |  |  | $ | (286 | ) |  | $ | 2,193 |
Total amortization expense of intangible assets was $47 and $11 for the three months ended March 31, 2019 and 2018.

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- Definition The entire disclosure for all or part of the information related to 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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