Segment, Customer Concentration and Geographical Information - Company Revenue in Different Geographic Locations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue from External Customer [Line Items]
Total revenues	$ 11,843	$ 8,746	$ 10,484	$ 11,602	$ 12,032	$ 11,012	$ 10,171	$ 10,114	$ 42,675	$ 43,329	$ 57,767
Americas [Member]
Revenue from External Customer [Line Items]
Total revenues									38,532	37,724	51,784
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Total revenues									928	2,871	2,812
EMEA [Member]
Revenue from External Customer [Line Items]
Total revenues									$ 3,215	$ 2,734	$ 3,171