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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accrued Liabilities [Abstract]    
Salaries, employee benefits and related taxes $ 1,834 $ 1,758
Operating lease liabilities - current 354 0
CIRM upfront funding - current 1,600 2,583
Other 698 516
Accrued liabilities $ 4,486 $ 4,857