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Accrued Liabilities (Tables)
12 Months Ended
Dec. 31, 2020
Accrued Liabilities [Abstract]  
Schedule of Accrued Liabilities
Accrued liabilities were as follow (in thousands):
December 31,
20202019
Salaries, employee benefits and related taxes$1,716 $1,834 
Operating lease liabilities - current370 354 
CIRM upfront funding - current— 1,600 
Other400 698 
$2,486 $4,486