Information Regarding Net Revenue by Geographic Region (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Net revenue	$ 16,528	$ 13,392
Percentage of net revenue	100.00%	100.00%
Americas
Segment Reporting Information [Line Items]
Net revenue	$ 13,232	$ 9,108
Percentage of net revenue	80.00%	68.00%
Europe and the Middle East
Segment Reporting Information [Line Items]
Net revenue	$ 2,308	$ 1,879
Percentage of net revenue	14.00%	14.00%
Asia-Pacific
Segment Reporting Information [Line Items]
Net revenue	$ 988	$ 2,405
Percentage of net revenue	6.00%	18.00%