Information Regarding Net Revenue by Geographic Region (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Segment Reporting Information [Line Items]
Net revenue	$ 23,856	$ 25,612	$ 45,062	$ 48,032
Percentage of net revenue	100.00%	100.00%	100.00%	100.00%
Americas
Segment Reporting Information [Line Items]
Net revenue	12,619	12,058	22,825	21,792
Percentage of net revenue	53.00%	47.00%	51.00%	45.00%
Europe
Segment Reporting Information [Line Items]
Net revenue	7,842	9,113	15,374	18,645
Percentage of net revenue	33.00%	36.00%	34.00%	39.00%
Asia-Pacific
Segment Reporting Information [Line Items]
Net revenue	$ 3,395	$ 4,441	$ 6,863	$ 7,595
Percentage of net revenue	14.00%	17.00%	15.00%	16.00%