XML 54 R43.htm IDEA: XBRL DOCUMENT v3.10.0.1
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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenues $ 49,057 $ 59,913 $ 95,790 $ 115,302
United States and Canada        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenues 32,562 44,565 62,668 83,913
South Africa        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenues 10,208 10,111 20,893 19,940
Other        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenues $ 6,287 $ 5,237 $ 12,229 $ 11,449