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, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenue from External Customer [Line Items]
Total revenues	$ 8,528	$ 10,484	$ 16,977	$ 22,086
Americas [Member]
Revenue from External Customer [Line Items]
Total revenues	8,405	10,223	16,588	21,022
EMEA [Member]
Revenue from External Customer [Line Items]
Total revenues	58	121	178	622
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenues	$ 65	$ 140	$ 211	$ 442