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Accrued Liabilities
9 Months Ended
Sep. 30, 2021
Accrued Liabilities  
Accrued Liabilities

5. Accrued Liabilities

Accrued liabilities consist of the following (in thousands):

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September 30, 

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December 31, 

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2021

    

2020

    

Accrued compensation

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$

942

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$

1,697

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Accrued professional fees and other

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2,957

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1,651

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Total accrued liabilities 

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$

3,899

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$

3,348

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​