Information Regarding Net Revenue by Geographic Region (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net revenue	$ 56,168	$ 60,794
Percentage of net revenue	100.00%	100.00%
Americas
Segment Reporting Information [Line Items]
Net revenue	$ 38,135	$ 40,848
Percentage of net revenue	68.00%	67.00%
Europe And Middle East
Segment Reporting Information [Line Items]
Net revenue	$ 8,589	$ 9,472
Percentage of net revenue	15.00%	16.00%
Asia-Pacific
Segment Reporting Information [Line Items]
Net revenue	$ 9,444	$ 10,474
Percentage of net revenue	17.00%	17.00%