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Balance Sheet Components - Prepaid and Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Prepaid and Other Current Assets    
Interest receivable $ 31 $ 32
Prepaid research and development manufacturing expenses 130 740
Prepaid facility expenses 182 174
Prepaid insurance 412 280
Other 397 128
Total of prepaid and other current assets $ 1,152 $ 1,354