Information Regarding Net Revenue by Geographic Region (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Net revenue	$ 13,392	$ 12,485
Percentage of net revenue	100.00%	100.00%
Americas
Segment Reporting Information [Line Items]
Net revenue	$ 8,777	$ 8,221
Percentage of net revenue	66.00%	66.00%
Europe And Middle East
Segment Reporting Information [Line Items]
Net revenue	$ 2,223	$ 2,068
Percentage of net revenue	17.00%	17.00%
Asia-Pacific
Segment Reporting Information [Line Items]
Net revenue	$ 2,392	$ 2,196
Percentage of net revenue	17.00%	18.00%