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Geographic Information and Concentrations of Risk - Schedule of Geographic Concentration of Net Revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net revenues $ 48,556 $ 46,733
United States and Canada    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net revenues 33,494 30,106
South Africa    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net revenues 8,369 10,685
Other    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net revenues $ 6,693 $ 5,942