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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accrued Liabilities [Abstract]    
Salaries, employee benefits and related taxes $ 1,293 $ 1,758
Operating lease liabilities - current 382 0
CIRM upfront funding - current 2,743 2,583
Other 735 516
Total accrued liabilities $ 5,153 $ 4,857