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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Accrued Liabilities [Abstract]    
Salaries, employee benefits and related taxes $ 666 $ 1,389
Retention payments 2,233 2,233
Professional fees 161 287
CIRM upfront funding - current 2,583 2,446
Other 1,355 1,456
Total accrued liabilities $ 6,998 $ 7,811