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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accrued Liabilities [Abstract]    
Salaries, employee benefits and related taxes $ 1,716 $ 1,834
Operating lease liabilities - current 370 354
CIRM upfront funding - current 0 1,600
Other 400 698
Accrued liabilities $ 2,486 $ 4,486