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Information Regarding Net Revenue by Geographic Region (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Segment Reporting Information [Line Items]    
Net revenue $ 19,522 $ 16,528
Geographic Concentration Risk | Revenue from Contract with Customer    
Segment Reporting Information [Line Items]    
Percentage of net revenue 100.00% 100.00%
Americas    
Segment Reporting Information [Line Items]    
Net revenue $ 14,725 $ 13,232
Americas | Geographic Concentration Risk | Revenue from Contract with Customer    
Segment Reporting Information [Line Items]    
Percentage of net revenue 75.00% 80.00%
Europe and the Middle East    
Segment Reporting Information [Line Items]    
Net revenue $ 2,930 $ 2,308
Europe and the Middle East | Geographic Concentration Risk | Revenue from Contract with Customer    
Segment Reporting Information [Line Items]    
Percentage of net revenue 15.00% 14.00%
Asia-Pacific    
Segment Reporting Information [Line Items]    
Net revenue $ 1,867 $ 988
Asia-Pacific | Geographic Concentration Risk | Revenue from Contract with Customer    
Segment Reporting Information [Line Items]    
Percentage of net revenue 10.00% 6.00%