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Commitments - Right of Use Assets and Liabilities (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) ft² | May 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Weighted average incremental borrowing rate used to determine initial value of right of use ROU assets and lease liabilities |  |  | 6.75% | 6.75%
ROU asset |  |  | $ 334 | $ 203
Lease liability |  |  | 219 | 154
Lease liabilities, long term |  |  | 140 | 66
Rent expense |  |  | $ 263 | $ 283
Right of use assets and liabilities |  |  |  |
Weighted-average remaining lease term |  |  | 1 year 5 months 12 days |
JAPAN |  |  |  |
Area of sublease space | ft² | 500 |  |  |
Sublease rent per month | $ 900 |  |  |
Singapore |  |  |  |
Area of sublease space | ft² | 4,544 |  |  |
Sublease rent per month | $ 9,700 |  |  |
Hong Kong |  |  |  |
Area of sublease space | ft² | 3,000 |  |  |
Sublease rent per month | $ 2,000 |  |  |
Space located in Irvine, California for executive offices, sales, finance and administration |  |  |  |
Area of sublease space | ft² | 4,351 |  |  |
Sublease rent per month | $ 5,439 |  |  |
Percentage of annual increase in sublease rent | 3.00% |  |  |
Shenzhen, China manufacturing facility |  |  |  |
Area of sublease space | ft² | 14,476 |  |  |
Sublease rent per month | $ 7,800 | $ 7,300 |  |

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