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Balance Sheet Components - Schedule of Other Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]    
Prepaid insurance $ 763 $ 861
Deposits for manufacturing components 116 82
Deferred offering costs 44 289
Other 13 12
Total Other Assets $ 936 $ 1,244