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Goodwill and Intangible Assets | 12 Months Ended
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Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | 4. Goodwill and Intangible Assets 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 |
Intangible assets amortization expense was $0.9 million and $0.2 million for the years ended December 31, 2019 and 2018, respectively. 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 |
Valuation of Goodwill and Intangible Assets The Company accounts for goodwill and intangible assets as required by FASB ASC Topic No. 350, Intangibles-Goodwill and Other. This statement requires us to periodically assess the impairment of our goodwill and intangible assets, which requires us to make assumptions and judgments regarding the carrying value of these assets. These assets are considered to be impaired if we determine that their carrying value may not be recoverable based upon our assessment of the following events or changes in circumstances:
| • | a determination that the carrying value of such assets cannot be recovered through undiscounted cash flows;
| • | loss of legal ownership or title to the assets;
| • | significant changes in our strategic business objectives and utilization of the assets; or
| • | the impact of significant negative industry or economic trends.
If the intangible assets are considered to be impaired, the impairment we recognize is the amount by which the carrying value of the intangible assets exceeds the fair value of the intangible assets. In addition, we base the useful lives and the related amortization expense on our estimate of the useful life of the intangible assets. Due to the numerous variables associated with our judgments and assumptions relating to the carrying value of our intangible assets and the effects of changes in circumstances affecting these valuations, both the precision and reliability of the resulting estimates are subject to uncertainty, and as additional information becomes known, we may change our estimate, in which case, the likelihood of a material change in our reported results would increase. The Company recognized an impairment loss of $0.4 million in the three and twelve months ended December 31, 2016 related to a previously acquired intangible asset. We review the recoverability of the carrying value of goodwill at least annually or whenever events or circumstances indicate a potential impairment. Our annual impairment testing date is December 31. Recoverability of goodwill is determined by comparing the estimated fair value of our reporting units to the carrying value of the underlying net assets in the reporting units. If the estimated fair value of a reporting unit is determined to be less than the fair value of its net assets, goodwill is deemed impaired and an impairment loss is recognized to the extent that the carrying value of goodwill exceeds the difference between the estimated fair value of the reporting unit and the fair value of its other assets and liabilities. We determined that we did not have any impairment of goodwill at December 31, 2019 and 2018.

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- Definition The entire disclosure for goodwill and 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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