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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Intangible Assets and Goodwill | The changes in the carrying amounts of finite-life intangible assets and goodwill for the years ended December 31, 2018 and 2017 are as follows (in thousands):
|  | December 31, 2018 |  |  | December 31, 2017 |
Intangibles, net: |  |  |  |  |  |  |  |
Beginning balance |  | $ | 7,207 |  |  | $ | 8,447 |
Increase |  |  | — |  |  |  | — |
Amortization |  |  | (1,250 | ) |  |  | (1,240 | )
Ending balance |  |  | 5,957 |  |  |  | 7,207 |
Goodwill, net: |  |  |  |  |  |  |  |
Beginning balance |  |  | 3,922 |  |  |  | 3,922 |
Increase (decrease) |  |  | — |  |  |  | — |
Ending balance |  |  | 3,922 |  |  |  | 3,922 |
Total goodwill and other intangibles, net |  | $ | 9,879 |  |  | $ | 11,129 |
Schedule of Estimated Fair Value Determined Using Option Pricing Model Assumptions | The warrants are not traded in an active securities market, and as such the estimated the fair value as of December 31, 2018 was determined by using an option pricing model with the following assumptions:
|  | As of December 31, 2018 |  |  | As of July 25, 2018 (inception date) |
Expected term |  | 2.1 years |  |  | 2.5 years |
Common stock market price |  | $ | 0.29 |  | $ | 0.72 |
Risk-free interest rate |  |  | 2.48% |  |  | 2.70% |
Expected volatility |  |  | 125% |  |  | 112% |
Resulting fair value (per warrant) |  | $ | 0.13 |  | $ | 0.45 |
Revenue by Product | The following table represents revenue by product (in thousands):
|  | Years ended December 31, |  |
|  | 2018 |  |  | 2017 |  |
Consumable |  | $ | 2,169 |  |  | $ | 1,918 |  |
Device |  |  | 225 |  |  |  | 576 |  |
Other products |  |  | 277 |  |  |  | 195 |  |
|  | $ | 2,671 |  |  | $ | 2,689 |  |
Product Revenues, Classified by Geographic Location | Product revenues, classified by geographic location, are as follows (in thousands):
|  | Years ended December 31, |
|  | 2018 |  |  | 2017 |
|  | Product Revenues |  |  | % of Total |  |  | Product Revenues |  |  | % of Total |
Americas |  | $ | 293 |  |  |  | 11 | % |  | $ | 345 |  |  |  | 13 | %
Japan |  |  | 2,058 |  |  |  | 77 | % |  |  | 1,924 |  |  |  | 71 | %
EMEA |  |  | 270 |  |  |  | 10 | % |  |  | 344 |  |  |  | 13 | %
Asia Pacific |  |  | 50 |  |  |  | 2 | % |  |  | 76 |  |  |  | 3 | %
Total product revenues |  | $ | 2,671 |  |  |  | 100 | % |  | $ | 2,689 |  |  |  | 100 | %

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