Information Regarding Net Revenue by Geographic Region (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Net revenue	$ 17,196	$ 22,712	$ 47,717	$ 61,867
Percentage of net revenue	100.00%	100.00%	100.00%	100.00%
Americas
Segment Reporting Information [Line Items]
Net revenue	$ 12,473	$ 15,655	$ 32,423	$ 38,933
Percentage of net revenue	73.00%	69.00%	68.00%	63.00%
Europe And Middle East
Segment Reporting Information [Line Items]
Net revenue	$ 2,294	$ 3,930	$ 7,386	$ 12,722
Percentage of net revenue	13.00%	17.00%	15.00%	21.00%
Asia-Pacific
Segment Reporting Information [Line Items]
Net revenue	$ 2,429	$ 3,127	$ 7,908	$ 10,212
Percentage of net revenue	14.00%	14.00%	17.00%	17.00%