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Balance Sheet Account Detail - Other Long-Term Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Operating lease liability, non-current portion $ 405 $ 549
Derivative liability 107 0
Employee stock option early exercise liability, non-current portion 12 56
Other long-term liabilities $ 524 $ 605