Information Regarding Net Revenue by Geographic Region (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Net revenue	$ 23,026	$ 20,022	$ 64,785	$ 56,844
Geographic Concentration Risk | Revenue from Contract with Customer
Segment Reporting Information [Line Items]
Percentage of net revenue	100.00%	100.00%	100.00%	100.00%
Americas
Segment Reporting Information [Line Items]
Net revenue	$ 17,825	$ 15,035	$ 48,495	$ 44,172
Americas | Geographic Concentration Risk | Revenue from Contract with Customer
Segment Reporting Information [Line Items]
Percentage of net revenue	77.00%	75.00%	75.00%	78.00%
Europe and the Middle East
Segment Reporting Information [Line Items]
Net revenue	$ 2,436	$ 2,161	$ 8,790	$ 6,992
Europe and the Middle East | Geographic Concentration Risk | Revenue from Contract with Customer
Segment Reporting Information [Line Items]
Percentage of net revenue	11.00%	11.00%	14.00%	12.00%
Asia-Pacific
Segment Reporting Information [Line Items]
Net revenue	$ 2,765	$ 2,826	$ 7,500	$ 5,680
Asia-Pacific | Geographic Concentration Risk | Revenue from Contract with Customer
Segment Reporting Information [Line Items]
Percentage of net revenue	12.00%	14.00%	11.00%	10.00%