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Geographic Information and Concentrations of Risk - Net Revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenues $ 65,693 $ 80,689 $ 123,290 $ 137,529
United States and Canada        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenues 51,473 69,080 94,209 111,430
South Africa        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenues 7,790 5,856 14,898 14,094
Other        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenues $ 6,430 $ 5,753 $ 14,183 $ 12,005