Information Regarding Net Revenue by Geographic Region (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net revenue	$ 78,142	$ 60,219
Geographic Concentration Risk | Revenue from Contract with Customer
Segment Reporting Information [Line Items]
Percentage of net revenue	100.00%	100.00%
Americas
Segment Reporting Information [Line Items]
Net revenue	$ 60,153	$ 40,018
Americas | Geographic Concentration Risk | Revenue from Contract with Customer
Segment Reporting Information [Line Items]
Percentage of net revenue	77.00%	67.00%
Europe and the Middle East
Segment Reporting Information [Line Items]
Net revenue	$ 9,943	$ 7,887
Europe and the Middle East | Geographic Concentration Risk | Revenue from Contract with Customer
Segment Reporting Information [Line Items]
Percentage of net revenue	13.00%	13.00%
Asia-Pacific
Segment Reporting Information [Line Items]
Net revenue	$ 8,046	$ 12,314
Asia-Pacific | Geographic Concentration Risk | Revenue from Contract with Customer
Segment Reporting Information [Line Items]
Percentage of net revenue	10.00%	20.00%