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Commitments and Contingencies (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 USD ($) ft² | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) ft² | Sep. 30, 2015 USD ($)
Product Warranty [Abstract] |  |  |  |
Period of warranty |  |  | 12 months |
Change in warranty accrual [Roll Forward] |  |  |  |
Beginning accrued warranty and related costs | $ 330 | $ 668 | $ 497 | $ 802
Accruals for warranties issued | 3 | 78 | 26 | 663
Adjustments related to pre-existing warranties including expirations and changes in estimates | (57) | (4) | (188) | (256)
Cost of warranty repair | (10) | (122) | (69) | (589)
Ending accrued warranty and related costs | $ 266 | $ 620 | $ 266 | $ 620
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 |
Term of royalty agreement |  |  | 8 years |
Aggregate amount payable towards royalty | $ 7,000 |  | $ 7,000 |
Operating leases |  |  |  |
Less than 1 year | 206 |  | 206 |
1-3 years | 91 |  | 91 |
4-5 years | 52 |  | 52 |
More than 5 years | 73 |  | 73 |
Total | 422 |  | 422 |
Royalty agreement |  |  |  |
Less than 1 year | 575 |  | 575 |
1-3 years | 719 |  | 719 |
Total | 1,294 |  | 1,294 |
Total |  |  |  |
Less than 1 year | 781 |  | 781 |
1-3 years | 810 |  | 810 |
4-5 years | 52 |  | 52 |
More than 5 years | 73 |  | 73 |
Total | $ 1,716 |  | $ 1,716 |

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