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REVENUE - Summary of Revenue as Disaggregated by Market Based on Location (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]        
Total revenues $ 15,924 $ 10,392 $ 35,509 $ 21,909
U.K. and Ireland        
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]        
Total revenues 6,718 5,410 12,993 11,682
Other Europe        
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]        
Total revenues 2,083 2,822 4,033 5,822
North America        
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]        
Total revenues 6,221 1,408 16,860 3,060
Rest of the world        
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]        
Total revenues $ 902 $ 752 $ 1,623 $ 1,345