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Balance Sheet Components - Summary of Accrued and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract]    
Accrued expenses $ 2,569 $ 1,971
Current portion of lease liabilities 486 395
Short term interest payable 272 274
Other accrued liabilities 510 446
Total accrued and other current liabilities $ 3,837 $ 3,086