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Segment Information and Geographic Data - Long Lived Assets by Geographical Region (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]    
Total long lived assets $ 52,468 $ 43,294
Americas [Member]    
Segment Reporting Information [Line Items]    
Total long lived assets 35,186 29,764
Europe [Member]    
Segment Reporting Information [Line Items]    
Total long lived assets 13,913 11,257
Asia Pacific [Member]    
Segment Reporting Information [Line Items]    
Total long lived assets $ 3,369 $ 2,273
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 33.00% 31.00%