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Commitments and Contingencies- Right of Use Assets and Liabilities (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) ft² | Jun. 30, 2020 USD ($) ft² | May 31, 2020 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($)
ROU asset |  |  |  | $ 119 |  | $ 163
Lease liability |  |  |  | 114 |  | 138
Lease liabilities, long term |  |  |  | $ 14 |  | $ 37
Period Of Warranty From Date Of Shipment |  |  |  | 1 year |  |
Extended warranty minimum period |  |  |  | 1 year |  |
Right of use assets and liabilities |  |  |  |  |  |
Weighted-average remaining lease term |  |  |  | 4 months 24 days |  |
Operating lease costs |  |  |  | $ 61 | $ 82 |
Chief Executive Officer |  |  |  |  |  |
Period for Severance Payment |  |  |  | 12 months |  |
JAPAN |  |  |  |  |  |
Area of sublease space | ft² | 500 | 500 |  |  |  |
Sublease rent per month |  | $ 1 |  |  |  |
Singapore |  |  |  |  |  |
Area of sublease space | ft² | 275 | 275 |  |  |  |
Hong Kong |  |  |  |  |  |
Area of sublease space | ft² | 3,000 | 3,000 |  |  |  |
Sublease rent per month |  | $ 2 |  |  |  |
Cost of revenue |  |  |  |  |  |
Right of use assets and liabilities |  |  |  |  |  |
Operating lease costs |  |  |  | $ 29 | 30 |
Operating expenses |  |  |  |  |  |
Right of use assets and liabilities |  |  |  |  |  |
Operating lease costs |  |  |  | $ 32 | $ 52 |
Space located in Irvine, California for executive offices, sales, finance and administration |  |  |  |  |  |
Area of sublease space | ft² | 4,351 | 4,351 |  |  |  |
Sublease rent per month |  | $ 6 |  |  |  |
Percentage of annual increase in sublease rent |  | 3.00% |  |  |  |
Shenzhen, China manufacturing facility |  |  |  |  |  |
Area of sublease space | ft² | 14,476 | 14,476 |  |  |  |
Sublease rent per month |  | $ 8 | $ 7 |  |  |
Shenzhen, China manufacturing facility | Singapore |  |  |  |  |  |
Sublease rent per month |  | $ 1 |  |  |  |
Office space located in Los Angels, California |  |  |  |  |  |
Area of sublease space | ft² | 425 | 425 |  |  |  |
Sublease rent per month | $ 1 |  |  |  |  |

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