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Balance Sheet Components - Prepaid and Other Current Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Prepaid and Other Current Assets    
Interest receivable $ 56 $ 32
Prepaid research and development manufacturing expenses 535 740
Prepaid facility expenses 182 174
Prepaid insurance 621 280
Other 395 128
Total of prepaid and other current assets $ 1,789 $ 1,354