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Intangible Assets | 12 Months Ended
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Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract] |
Intangible Assets | 7. Intangible Assets During the fourth quarter of 2016, we reviewed our long-lived assets for indicators of impairment. Based on reduced estimates of future revenues and future negative cash flow, we identified potential indicators of impairment. As a result, we compared the fair value of our long-lived assets to their carrying value. Based on our discounted future cash flow and revenue projections, we recorded a non-cash impairment charge of $120 thousand for the Ocunetics patent. The impairment charge represents the excess of the carrying value of the asset over its fair value. The impairment charge is not expected to result in any future cash expenditures. 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 |  |  |
The components of our purchased intangible assets as of January 2, 2016 are as follows (in thousands):
|  | Useful Lives |  | FY 2015 Annual Amortization |  |  | Gross Carrying Value |  |  | Accumulated Amortization |  |  | Net Carrying Value |  |  | Useful Lives Remaining
Customer relations |  | 15 Years |  | $ | 16 |  |  | $ | 240 |  |  | $ | 92 |  |  | $ | 148 |  |  | 9.25 Years
Patents |  | Varies |  |  | - |  |  |  | 720 |  |  |  | 600 |  |  |  | 120 |  |  | Varies
|  |  |  | $ | 16 |  |  | $ | 960 |  |  | $ | 692 |  |  | $ | 268 |  |  |
Aggregate amortization expense for the fiscal years 2016, 2015 and 2014 was $16 thousand, $16 thousand and $44 thousand, respectively. 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: |  |  |  |
2017 |  | $ | 16 |
2018 |  |  | 16 |
2019 |  |  | 16 |
2020 |  |  | 16 |
2021 |  |  | 16 |
Thereafter |  |  | 52 |
Total |  | $ | 132 |

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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 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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