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Intangible Assets | 9 Months Ended
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Sep. 30, 2017
Goodwill And Intangible Assets Disclosure [Abstract] |
Intangible Assets | 10. Intangible Assets The following table sets forth our acquired intangible assets by major asset class as of September 30, 2017 and December 31, 2016 (in thousands except for useful life data):
|  |  |  |  |  | September 30, 2017 |  |  | December 31, 2016 |
|  | Useful life |  |  |  |  |  |  | Accumulated |  |  | Net |  |  |  |  |  |  | Accumulated |  |  | Net book value |  |  | Impairment |  |  | Net |
|  | (years) |  |  | Gross |  |  | amortization |  |  | book value |  |  | Gross |  |  | amortization |  |  | before impairment |  |  | charge |  |  | book value |
Purchased technology |  | 5-6 |  |  | $ | 265 |  |  | $ | (66 | ) |  | $ | 199 |  |  | $ | 265 |  |  | $ | (32 | ) |  | $ | 233 |  |  | $ | — |  |  | $ | 233 |
Customer relationships |  | 3-6 |  |  |  | 528 |  |  |  | (220 | ) |  |  | 308 |  |  |  | 999 |  |  |  | (147 | ) |  |  | 852 |  |  |  | (411 | ) |  |  | 441 |
Trademarks/trade names |  |  | 2 |  |  |  | 38 |  |  |  | (24 | ) |  |  | 14 |  |  |  | 38 |  |  |  | (9 | ) |  |  | 29 |  |  |  | — |  |  |  | 29 |
Non-compete |  |  | 3 |  |  |  | 51 |  |  |  | (21 | ) |  |  | 30 |  |  |  | 51 |  |  |  | (9 | ) |  |  | 42 |  |  |  | — |  |  |  | 42 |
Total |  |  |  |  |  | $ | 882 |  |  | $ | (331 | ) |  | $ | 551 |  |  | $ | 1,353 |  |  | $ | (197 | ) |  | $ | 1,156 |  |  | $ | (411 | ) |  | $ | 745 |
Intangible assets amortization expense was $0.1 million and $0.2 million for the three and nine months ended September 30, 2017, respectively, and $0.1 million for the three and nine months ended September 30, 2016. The Company determined there was an impairment of its Customer Relationships intangible asset in the amount of $0.4 million as of December 31, 2016. Future amortization expense related to intangible assets as of September 30, 2017 are as follows (in thousands):
Year Ending December 31, |  |  |  |
2017 - 3 months remaining |  | $ | 64 |
2018 |  |  | 249 |
2019 |  |  | 143 |
2020 |  |  | 47 |
2021 |  |  | 40 |
Beyond |  |  | 8 |
Total |  | $ | 551 |

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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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