Quarterly report pursuant to Section 13 or 15(d)

Reportable Segments - Revenue by Geographic Region (Details)

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Reportable Segments - Revenue by Geographic Region (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues $ 123,395 $ 118,308 $ 351,673 $ 326,186
United States        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 57,016 51,444 153,665 129,405
Russia        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 30,315 35,794 90,378 106,819
EMEA & Asia        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 23,902 15,646 66,206 44,283
Latin America        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 2,596 2,393 10,214 8,013
Other CIS        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 2,743 6,378 9,799 18,439
Other        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues $ 6,823 $ 6,653 $ 21,411 $ 19,227