Segment, Customer Concentration and Geographical Information - Company Revenue in Different Geographic Locations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenue from External Customer [Line Items]
Total revenues	$ 9,586	$ 9,448	$ 29,501	$ 26,425
Americas [Member]
Revenue from External Customer [Line Items]
Total revenues	9,514	8,859	29,079	25,447
EMEA [Member]
Revenue from External Customer [Line Items]
Total revenues	46	541	171	719
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenues	$ 26	$ 48	$ 251	$ 259