Segment, Customer Concentration and Geographical Information - Company Revenue in Different Geographic Locations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenue from External Customer [Line Items]
Total revenues	$ 8,746	$ 11,012	$ 30,832	$ 31,297
Americas [Member]
Revenue from External Customer [Line Items]
Revenues from external customers attributed to all foreign countries	8,318	9,863	29,340	26,855
EMEA [Member]
Revenue from External Customer [Line Items]
Revenues from external customers attributed to all foreign countries	166	780	788	2,218
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Revenues from external customers attributed to all foreign countries	$ 262	$ 369	$ 704	$ 2,224