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Accrued liabilities
3 Months Ended
Mar. 31, 2021
Payables and Accruals [Abstract]  
Accrued liabilities Accrued liabilities
As of March 31, 2021 and December 31, 2020, accrued liabilities consisted of the following (in thousands):
As of
March 31,
As of
December 31,
20212020
(unaudited)
Accrued compensation and benefit expenses$7,024 $9,838 
Other accrued liabilities5,922 6,672 
Total accrued liabilities$12,946 $16,510