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Segment Information and Geographic Data - Revenues by Geographical Region (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]        
Total Revenues $ 97,726 $ 70,589 $ 269,071 $ 194,523
Americas [Member]        
Segment Reporting Information [Line Items]        
Total Revenues 72,930 56,727 205,556 158,331
Europe [Member]        
Segment Reporting Information [Line Items]        
Total Revenues 19,092 11,092 49,041 29,538
Asia Pacific [Member]        
Segment Reporting Information [Line Items]        
Total Revenues $ 5,704 $ 2,770 $ 14,474 $ 6,654
Revenue [Member] | Outside Of Americas [Member] | Geographic Concentration Risk [Member]        
Segment Reporting Information [Line Items]        
Percentage of revenues generated outside of the Americas 25.00% 20.00% 24.00% 19.00%