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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Accrued Liabilities [Abstract]    
Salaries, employee benefits and related taxes $ 1,379 $ 1,389
Retention payments 0 2,233
CIRM upfront funding - current 2,583 2,446
Other 483 1,743
Total accrued liabilities $ 4,445 $ 7,811