Information Regarding Net Revenue by Geographic Region (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Net revenue	$ 60,794	$ 81,249
Percentage of net revenue	100.00%	100.00%
Americas - United States
Segment Reporting Information [Line Items]
Net revenue	$ 40,848	$ 51,318
Americas - Other
Segment Reporting Information [Line Items]
Net revenue		4
Americas
Segment Reporting Information [Line Items]
Net revenue	$ 40,848	$ 51,322
Percentage of net revenue	67.00%	63.00%
Europe And Middle East
Segment Reporting Information [Line Items]
Net revenue	$ 9,472	$ 15,835
Percentage of net revenue	16.00%	20.00%
Asia-Pacific
Segment Reporting Information [Line Items]
Net revenue	$ 10,474	$ 14,092
Percentage of net revenue	17.00%	17.00%