Information Regarding Net Revenue by Geographic Region (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Net revenue	$ 20,294	$ 14,840	$ 36,822	$ 28,232
Percentage of net revenue	100.00%	100.00%	100.00%	100.00%
Americas
Segment Reporting Information [Line Items]
Net revenue	$ 15,905	$ 9,495	$ 29,137	$ 18,603
Percentage of net revenue	78.00%	64.00%	79.00%	66.00%
Europe and the Middle East
Segment Reporting Information [Line Items]
Net revenue	$ 2,523	$ 2,117	$ 4,831	$ 3,996
Percentage of net revenue	12.00%	14.00%	13.00%	14.00%
Asia-Pacific
Segment Reporting Information [Line Items]
Net revenue	$ 1,866	$ 3,228	$ 2,854	$ 5,633
Percentage of net revenue	9.00%	22.00%	8.00%	20.00%