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Commitments and Contingencies- 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, 2021
USD ($)
Dec. 31, 2020
USD ($)
Right-of-use assets and lease liabilities capitalized     5.50% 6.75%
ROU asset     $ 163 $ 334
Lease liability     138 219
Lease liabilities, long term     $ 37 140
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     7 months 6 days  
Operating lease costs     $ 294 263
Chief Executive Officer        
Period for Severance Payment     12 months  
JAPAN        
Area of sublease space | ft² 500      
Sublease rent per month $ 1      
Singapore        
Area of sublease space | ft² 275      
Hong Kong        
Area of sublease space | ft² 3,000      
Sublease rent per month $ 2      
Cost of revenue        
Right of use assets and liabilities        
Operating lease costs     $ 122 98
Operating expenses        
Right of use assets and liabilities        
Operating lease costs     $ 172 $ 165
Space located in Irvine, California for executive offices, sales, finance and administration        
Area of sublease space | ft² 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      
Sublease rent per month $ 8 $ 7    
Shenzhen, China manufacturing facility | Singapore        
Sublease rent per month $ 1