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Geographic Information and Concentrations of Risk - Geographic Concentration of Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Geographic concentration of assets    
Assets $ 215,843 $ 227,394
United States and Canada    
Geographic concentration of assets    
Assets 176,094 148,485
Europe    
Geographic concentration of assets    
Assets 35,630 27,277
South Africa    
Geographic concentration of assets    
Assets 0 48,211
Other    
Geographic concentration of assets    
Assets $ 4,119 $ 3,421