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Consolidated Balance Sheet Components (Details) - Schedule of other non-current liabilities - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Schedule of other non-current liabilities [Abstract]    
CIRM grant liability $ 600 $ 600
Accrued tax liability 24
Restricted stock liability 19 53
License option liability, non-current 200
Total $ 643 $ 853