Information Regarding Net Revenue by Geographic Region (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Net revenue	$ 14,840	$ 13,476	$ 28,232	$ 25,961
Percentage of net revenue	100.00%	100.00%	100.00%	100.00%
Americas
Segment Reporting Information [Line Items]
Net revenue	$ 9,495	$ 9,198	$ 18,603	$ 17,419
Percentage of net revenue	64.00%	68.00%	66.00%	67.00%
Europe And Middle East
Segment Reporting Information [Line Items]
Net revenue	$ 2,117	$ 1,752	$ 3,996	$ 3,820
Percentage of net revenue	14.00%	13.00%	14.00%	15.00%
Asia-Pacific
Segment Reporting Information [Line Items]
Net revenue	$ 3,228	$ 2,526	$ 5,633	$ 4,722
Percentage of net revenue	22.00%	19.00%	20.00%	18.00%