Information Regarding Net Revenue by Geographic Region (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Net revenue	$ 22,237	$ 20,294	$ 41,759	$ 36,822
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	$ 15,945	$ 15,905	$ 30,670	$ 29,137
Americas | Geographic Concentration Risk | Revenue from Contract with Customer
Segment Reporting Information [Line Items]
Percentage of net revenue	72.00%	79.00%	74.00%	79.00%
Europe and the Middle East
Segment Reporting Information [Line Items]
Net revenue	$ 3,423	$ 2,523	$ 6,353	$ 4,831
Europe and the Middle East | Geographic Concentration Risk | Revenue from Contract with Customer
Segment Reporting Information [Line Items]
Percentage of net revenue	15.00%	12.00%	15.00%	13.00%
Asia-Pacific
Segment Reporting Information [Line Items]
Net revenue	$ 2,869	$ 1,866	$ 4,736	$ 2,854
Asia-Pacific | Geographic Concentration Risk | Revenue from Contract with Customer
Segment Reporting Information [Line Items]
Percentage of net revenue	13.00%	9.00%	11.00%	8.00%