Information Regarding Net Revenue by Geographic Region (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Net revenue	$ 12,485	$ 14,934
Percentage of net revenue	100.00%	100.00%
Americas
Segment Reporting Information [Line Items]
Net revenue	$ 8,221	$ 9,958
Percentage of net revenue	66.00%	67.00%
Europe And Middle East
Segment Reporting Information [Line Items]
Net revenue	$ 2,068	$ 2,842
Percentage of net revenue	16.00%	19.00%
Asia-Pacific
Segment Reporting Information [Line Items]
Net revenue	$ 2,196	$ 2,134
Percentage of net revenue	18.00%	14.00%