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Commitments and Contingencies (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 31, 2017 | Sep. 30, 2017 USD ($) ft² | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) ft² | Sep. 30, 2016 USD ($)
Product Warranty [Abstract] |  |  |  |  |
Period of warranty |  |  |  | 12 months |
Change in warranty accrual [Roll Forward] |  |  |  |  |
Beginning accrued warranty and related costs |  | $ 130 | $ 330 | $ 251 | $ 497
Accruals for warranties issued |  | 7 | 3 | 77 | 26
Adjustments related to pre-existing warranties including expirations and changes in estimates |  | 18 | (57) | (114) | (188)
Cost of warranty repair |  | (17) | (10) | (76) | (69)
Ending accrued warranty and related costs |  | $ 138 | $ 266 | $ 138 | $ 266
Leases [Abstract] |  |  |  |  |
Area of property under long-term operating lease (in square feet) | ft² |  | 19,467 |  | 19,467 |
Additional years per lease option |  |  |  | 3 years |
Number of additional years to lease term | 3 years |  |  |  |
Term of royalty agreement |  |  |  | 8 years |
Aggregate amount payable towards royalty |  | $ 7,000 |  | $ 7,000 |
Operating leases |  |  |  |  |
Less than 1 year |  | 202 |  | 202 |
1-3 years |  | 350 |  | 350 |
4-5 years |  | 93 |  | 93 |
More than 5 years |  | 6 |  | 6 |
Total |  | 651 |  | 651 |
Royalty agreement |  |  |  |  |
Less than 1 year |  | 575 |  | 575 |
1-3 years |  | 144 |  | 144 |
Total |  | 719 |  | 719 |
Total |  |  |  |  |
Less than 1 year |  | 777 |  | 777 |
1-3 years |  | 494 |  | 494 |
4-5 years |  | 93 |  | 93 |
More than 5 years |  | 6 |  | 6 |
Total |  | 1,370 |  | 1,370 |
Dingxing |  |  |  |  |
Leases [Abstract] |  |  |  |  |
Total investment agreement value |  | 90,000 |  | 90,000 |
Kazuo |  |  |  |  |
Leases [Abstract] |  |  |  |  |
Total investment agreement value |  | $ 15,000 |  | $ 15,000 |

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