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Geographic Information and Concentrations of Risk - Schedule of Geographic Concentration of Net Revenues (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenues $ 62,716 $ 50,630 $ 167,163 $ 146,420
United States and Canada        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenues 47,378 35,891 122,331 98,559
South Africa        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenues 9,237 9,145 26,164 30,038
Other        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenues $ 6,101 $ 5,594 $ 18,668 $ 17,823