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Accrued Liabilities
 6 Months Ended
Jun. 30, 2020
Accrued Liabilities [Abstract]  
Accrued Liabilities Accrued Liabilities
Accrued liabilities as of June 30, 2020 and December 31, 2019 were as follows (in thousands):
June 30, 2020December 31, 2019
Salaries, employee benefits and related taxes$1,441  $1,834  
Operating lease liabilities -- current349  354  
CIRM upfront funding -- current229  1,600  
Other869  698  
Total$2,888  $4,486