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Intangible Assets | 3 Months Ended
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Mar. 31, 2019
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Intangible Assets, Net and Goodwill | Intangible Assets, net The following table summarizes the Company’s intangible assets as of March 31, 2019 and December 31, 2018:
|  | Estimated Useful Life (Years) |  | Gross Carrying Amount at December 31, 2018 |  | Accumulated Amortization |  | Net Book Value at March 31, 2019
Developed technology |  | 13 |  | $ | 18,800 |  |  | $ | 1,205 |  |  | $ | 17,595 |
Customer relationships |  | 1 |  | 270 |  |  | 225 |  |  | 45 |
|  |  |  | $ | 19,070 |  |  | $ | 1,430 |  |  | $ | 17,640 |
The Company uses the straight-line method to determine the amortization expense for its definite lived intangible assets. The weighted-average remaining useful life for the intangible assets is 12.1 years. Amortization expense related to the purchased intangible assets was $430 for the three months ended March 31, 2019. The table below reflects the future estimated amortization expense for amortizable intangible assets as of March 31, 2019.
Remainder of 2019 |  | $ | 1,130 |
2020 |  | 1,446 |
2021 |  | 1,446 |
2022 |  | 1,446 |
2023 |  | 1,446 |
Thereafter |  | 10,726 |
Total |  | $ | 17,640 |

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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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- References No definition available. + Details
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