Segment, Customer Concentration and Geographical Information - Company Revenue in Different Geographic Locations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenue from External Customer [Line Items]
Total revenues	$ 10,529	$ 8,449
Americas [Member]
Revenue from External Customer [Line Items]
Total revenues	10,312	8,183
EMEA [Member]
Revenue from External Customer [Line Items]
Total revenues	52	120
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenues	$ 165	$ 146