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Geographic Information and Concentrations of Risk - Schedule of Geographic Concentration of Net Revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenues $ 55,891 $ 49,057 $ 104,447 $ 95,790
United States and Canada        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenues 41,459 32,562 74,953 62,668
South Africa        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenues 8,558 10,208 16,927 20,893
Other        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenues $ 5,874 $ 6,287 $ 12,567 $ 12,229