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Balance Sheet Details - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Prepaid Expense And Other Assets Current [Abstract]    
Prepaid expenses $ 1,421 $ 60
Security deposits 104 47
Interest receivable 47 10
Other   25
Total $ 1,572 $ 142