Enterprise-Wide Information - Revenue by Geography (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenue from External Customer [Line Items]
Net revenue	$ 30,048	$ 30,835	$ 58,427	$ 57,897
United States
Revenue from External Customer [Line Items]
Net revenue	10,077	12,203	19,250	22,482
Canada
Revenue from External Customer [Line Items]
Net revenue	1,113	1,072	1,810	2,475
Total North America
Revenue from External Customer [Line Items]
Net revenue	11,190	13,275	21,060	24,957
Latin America
Revenue from External Customer [Line Items]
Net revenue	7,654	8,444	12,293	15,649
Europe, Middle East, Africa
Revenue from External Customer [Line Items]
Net revenue	10,043	8,493	23,278	16,102
Asia Pacific
Revenue from External Customer [Line Items]
Net revenue	1,161	623	1,796	1,189
Total International
Revenue from External Customer [Line Items]
Net revenue	$ 18,858	$ 17,560	$ 37,367	$ 32,940