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INTANGIBLES | 12 Months Ended
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Dec. 31, 2018
INTANGIBLES [Abstract] |
INTANGIBLES | 5. INTANGIBLES In conjunction with the Merger, we recorded intangible assets of $21.1 million. Our intangible assets consisted of the following:
|  | Dollars in Thousands
|  | December 31, 2018
|  |  |  |  | Accumulated |  | Net Book
|  | Cost |  | Amortization |  | Value
Technology |  | $ | 18,990 |  | $ | 1,424 |  | $ | 17,566
Customer relationships |  |  | 250 |  |  | 125 |  |  | 125
Backlog |  |  | 200 |  |  | 200 |  |  | —
Covenants not to compete |  |  | 30 |  |  | 30 |  |  | —
Trademark |  |  | 40 |  |  | 30 |  |  | 10
IPR&D |  |  | 1,590 |  |  | — |  |  | 1,590
|  | $ | 21,100 |  | $ | 1,809 |  | $ | 19,291
|  | Dollars in Thousands
|  | December 31, 2017
|  |  |  |  | Accumulated |  | Net Book
|  | Cost |  | Amortization |  | Value
Technology |  | $ | 18,990 |  | $ | 475 |  | $ | 18,515
Customer relationships |  |  | 250 |  |  | 42 |  |  | 208
Backlog |  |  | 200 |  |  | 100 |  |  | 100
Covenants not to compete |  |  | 30 |  |  | 15 |  |  | 15
Trademark |  |  | 40 |  |  | 10 |  |  | 30
IPR&D |  |  | 1,590 |  |  | — |  |  | 1,590
|  | $ | 21,100 |  | $ | 642 |  | $ | 20,458
|  | Estimated Useful Life |
Technology |  | 20 | years
Customer relationships |  | 3 | years
Backlog |  | 1 | year
Covenants not to compete |  | 1 | year
Trademark |  | 2 | years
Until our in-process research and development projects are completed, the assets are accounted for as indefinite-lived intangible assets and subject to impairment testing. For the year ended December 31, 2018, there was no impairment of IPR&D. Amortization expense for intangible assets was $1.2 million during the year ended December 31, 2018 and $0.6 million during the year ended December 31, 2017. Amortization expense for intangible assets is expected to be $1.0 million, $1.0 million, $0.9 million, $0.9 million and $0.9 million for each of the years ending December 31, 2019, 2020, 2021, 2022 and 2023, respectively.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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