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Intangible Assets | 12 Months Ended
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Dec. 30, 2017
Goodwill And Intangible Assets Disclosure [Abstract] |
Intangible Assets | 7. Intangible Assets The components of our purchased intangible assets as of December 30, 2017 are as follows (in thousands):
|  | Useful Lives |  | FY 2017 Annual Amortization |  |  | Gross Carrying Value |  |  | Accumulated Amortization |  |  | Net Carrying Value |  |  | Useful Lives Remaining
Customer relations |  | 15 Years |  | $ | 16 |  |  | $ | 240 |  |  | $ | 124 |  |  | $ | 116 |  |  | 7.25 Years
Patents |  | Varies |  |  | - |  |  |  | 600 |  |  |  | 600 |  |  |  | - |  |  | Varies
|  |  |  | $ | 16 |  |  | $ | 840 |  |  | $ | 724 |  |  | $ | 116 |  |  |
The components of our purchased intangible assets as of December 31, 2016 are as follows (in thousands):
|  | Useful Lives |  | FY 2016 Annual Amortization |  |  | Gross Carrying Value |  |  | Accumulated Amortization |  |  | Net Carrying Value |  |  | Useful Lives Remaining
Customer relations |  | 15 Years |  | $ | 16 |  |  | $ | 240 |  |  | $ | 108 |  |  | $ | 132 |  |  | 8.25 Years
Patents |  | Varies |  |  | - |  |  |  | 720 |  |  |  | 720 |  |  |  | - |  |  | Varies
|  |  |  | $ | 16 |  |  | $ | 960 |  |  | $ | 828 |  |  | $ | 132 |  |  |
Aggregate amortization expense for each of the fiscal years 2017, 2016 and 2015 was $16 thousand. The amortization of customer relations was charged to sales and marketing expense and the amortization of patents was charged to cost of revenues. Estimated future amortization expense for purchased intangible assets is as follows (in thousands):
Fiscal Year: |  |  |  |
2018 |  | $ | 16 |
2019 |  |  | 16 |
2020 |  |  | 16 |
2021 |  |  | 16 |
2022 |  |  | 16 |
Thereafter |  |  | 36 |
Total |  | $ | 116 |

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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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