Segment, Customer Concentration and Geographical Information - Company Revenue in Different Geographic Locations (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenue from External Customer [Line Items]
Total revenues	$ 9,386	$ 8,528	$ 19,915	$ 16,977
Americas [Member]
Revenue from External Customer [Line Items]
Total revenues	9,253	8,405	19,565	16,588
EMEA [Member]
Revenue from External Customer [Line Items]
Total revenues	73	58	125	178
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenues	$ 60	$ 65	$ 225	$ 211