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Commitments and Contingencies (Details) $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
May 31, 2017 | Mar. 31, 2018 USD ($) ft² | Mar. 31, 2017 USD ($)
Product Warranty [Abstract] |  |  |
Period of warranty |  | 12 months |
Change in warranty accrual [Roll Forward] |  |  |
Beginning accrued product warranty |  | $ 133 | $ 251
Accruals for warranties issued |  | 59 | 33
Adjustments related to pre-existing warranties including expirations and changes in estimates |  | (46) | (105)
Cost of warranty repair |  | (29) | (46)
Ending accrued product warranty |  | $ 117 | $ 133
Leases [Abstract] |  |  |
Area of property under long-term operating lease (in square feet) | ft² |  | 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 |
Operating leases |  |  |
Less than 1 year |  | 226 |
1-3 years |  | 299 |
4-5 years |  | 25 |
Total |  | 550 |
Royalty agreement |  |  |
Less than 1 year |  | 431 |
Total |  | 431 |
Total |  |  |
Less than 1 year |  | 657 |
1-3 years |  | 299 |
4-5 years |  | 25 |
Total |  | 981 |
Dingxing |  |  |
Leases [Abstract] |  |  |
Total investment agreement value |  | 90,000 |
Kazuo |  |  |
Leases [Abstract] |  |  |
Total investment agreement value |  | $ 15,000 |

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