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Accrued Liabilities
 3 Months Ended
Mar. 31, 2022
Payables and Accruals [Abstract]  
Accrued Liabilities Accrued Liabilities
Current accrued liabilities are as follows (in thousands):
 March 31, 2022December 31, 2021
Severance costs$2,584 $2,581 
Loss on purchase commitments (Note 11)— 1,750 
Payroll and benefits993 1,054 
Legal costs885 1,013 
Contingent liability for earn-out provision702 608 
Deferred revenue, current567 528 
Taxes other than income taxes 304 241 
Other712 1,221 
Total current accrued liabilities$6,747 $8,996