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Geographic Information and Concentrations of Risk - Net Revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenues $ 66,217 $ 90,240 $ 189,507 $ 227,769
United States and Canada        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenues 56,614 77,208 150,822 188,638
South Africa        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenues 2,435 6,836 17,333 20,930
Other        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenues $ 7,168 $ 6,196 $ 21,352 $ 18,201