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Tax and tax incentive receivable
 12 Months Ended
Dec. 31, 2021
Receivables [Abstract]  
Tax and tax incentive receivable Tax incentive receivables
Taxes receivable consisted of the following (in thousands):
December 31,
20212020
R&D tax credit receivable - U.K.$15,583 $8,202 
Tax receivable - U.S.— 58 
Total tax receivable$15,583 $8,260