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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract] |
Schedule of Acquired Intangible Assets by Major Asset Class | The following table sets forth our acquired intangible assets by major asset class as of December 31, 2019 and December 31, 2018 (in thousands, except for useful life data):
|  |  |  | December 31, 2019 |
|  | Useful life (years) |  | Gross |  |  | Additions |  |  | Accumulated amortization |  |  | Net book value before impairment |  |  | Impairment charge in 2016 |  |  | Net book value |
Purchased technology |  | 4-6 |  | $ | 265 |  |  | $ | 2,253 |  |  | $ | (687 | ) |  | $ | 1,831 |  |  | $ | — |  |  | $ | 1,831 |
Customer relationships |  | 3-10 |  |  | 999 |  |  |  | 2,976 |  |  |  | (860 | ) |  |  | 3,115 |  |  |  | (411 | ) |  |  | 2,704 |
Trademarks/trade names |  | 2 |  |  | 38 |  |  |  | — |  |  |  | (38 | ) |  |  | — |  |  |  | — |  |  |  | — |
Non-compete |  | 3 |  |  | 51 |  |  |  | — |  |  |  | (51 | ) |  |  | — |  |  |  | — |  |  |  | — |
Total |  |  |  | $ | 1,353 |  |  | $ | 5,229 |  |  | $ | (1,636 | ) |  | $ | 4,946 |  |  | $ | (411 | ) |  | $ | 4,535 |
|  |  |  | December 31, 2018 |
|  | Useful life (years) |  | Gross |  |  | Additions |  |  | Accumulated amortization |  |  | Net book value before impairment |  |  | Impairment charge in 2016 |  |  | Net book value |
Purchased technology |  | 4-6 |  | $ | 265 |  |  | $ | — |  |  | $ | (125 | ) |  | $ | 140 |  |  | $ | — |  |  | $ | 140 |
Customer relationships |  | 3-6 |  |  | 999 |  |  |  | — |  |  |  | (499 | ) |  |  | 500 |  |  |  | (411 | ) |  |  | 89 |
Trademarks/trade names |  | 2 |  |  | 38 |  |  |  | — |  |  |  | (38 | ) |  |  | — |  |  |  | — |  |  |  | — |
Non-compete |  | 3 |  |  | 51 |  |  |  | — |  |  |  | (42 | ) |  |  | 9 |  |  |  | — |  |  |  | 9 |
Total |  |  |  | $ | 1,353 |  |  |  | — |  |  | $ | (704 | ) |  | $ | 649 |  |  | $ | (411 | ) |  | $ | 238 |
Future Amortization Expense Related to Intangible Assets | Future amortization expense related to intangible assets as of December 31, 2019 are as follows (in thousands):
Year Ending December 31, |  |  |  |
2020 |  | $ | 907 |
2021 |  |  | 901 |
2022 |  |  | 869 |
2023 |  |  | 345 |
2024 |  |  | 1,513 |
Total |  | $ | 4,535 |

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