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Segment Information and Geographic Data - Long Lived Assets by Geographical Region (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]    
Total long lived assets $ 40,601 $ 30,201
Americas [Member]    
Segment Reporting Information [Line Items]    
Total long lived assets 29,815 23,205
Europe [Member]    
Segment Reporting Information [Line Items]    
Total long lived assets 8,323 4,716
Asia Pacific [Member]    
Segment Reporting Information [Line Items]    
Total long lived assets $ 2,463 $ 2,280
Outside Of Americas [Member] | Assets Total [Member] | Geographic Concentration Risk [Member]    
Segment Reporting Information [Line Items]    
Percentage of long lived assets held outside of the Americas 27.00% 23.00%