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Balance Sheet Components (Tables)
 6 Months Ended
Jun. 30, 2022
Accrued Liabilities Current [Abstract]  
Schedule of Accrued Liabilities

Accrued liabilities

Accrued liabilities consisted of the following (in thousands):

 

 

June 30,

 

 

December 31,

 

 

 

2022

 

 

2021

 

Accrued research and development costs

 

$

1,540

 

 

$

5,303

 

Other liabilities

 

 

999

 

 

 

1,080

 

 

 

$

2,539

 

 

$

6,383