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Commitments and Contingencies (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
May 31, 2017 | Jun. 30, 2017 USD ($) ft² | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) ft² | Jun. 30, 2016 USD ($)
Product Warranty [Abstract] |  |  |  |  |
Period of warranty |  |  |  | 12 months |
Change in warranty accrual [Roll Forward] |  |  |  |  |
Beginning accrued warranty and related costs |  | $ 133 | $ 431 | $ 251 | $ 497
Accruals for warranties issued |  | 37 | 4 | 70 | 23
Adjustments related to pre-existing warranties including expirations and changes in estimates |  | (27) | (64) | (132) | (131)
Cost of warranty repair |  | (13) | (41) | (59) | (59)
Ending accrued warranty and related costs |  | $ 130 | $ 330 | $ 130 | $ 330
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 |  | 221 |  | 221 |
1-3 years |  | 351 |  | 351 |
4-5 years |  | 92 |  | 92 |
More than 5 years |  | 6 |  | 6 |
Total |  | 670 |  | 670 |
Royalty agreement |  |  |  |  |
Less than 1 year |  | 575 |  | 575 |
1-3 years |  | 287 |  | 287 |
Total |  | 862 |  | 862 |
Total |  |  |  |  |
Less than 1 year |  | 796 |  | 796 |
1-3 years |  | 638 |  | 638 |
4-5 years |  | 92 |  | 92 |
More than 5 years |  | 6 |  | 6 |
Total |  | $ 1,532 |  | $ 1,532 |

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