Segment, Customer Concentration and Geographical Information - Company Revenue in Different Geographic Locations (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]
Total revenues	$ 10,484	$ 10,171	$ 22,086	$ 20,285
Reportable Geographical Components [Member] | Americas [Member]
Revenue from External Customer [Line Items]
Revenues from external customers attributed to all foreign countries	10,223	8,308	21,022	16,992
Reportable Geographical Components [Member] | EMEA [Member]
Revenue from External Customer [Line Items]
Revenues from external customers attributed to all foreign countries	121	753	622	1,438
Reportable Geographical Components [Member] | Asia Pacific [Member]
Revenue from External Customer [Line Items]
Revenues from external customers attributed to all foreign countries	$ 140	$ 1,110	$ 442	$ 1,855