Segment Reporting - Classification of Revenue by Geography (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Total revenue	$ 7,218	$ 5,943	$ 12,894	$ 10,445
North America [Member] | Reportable Geographical Components [Member]
Segment Reporting Information [Line Items]
Total revenue	5,218	3,898	9,695	7,060
Europe & Middle East [Member] | Reportable Geographical Components [Member]
Segment Reporting Information [Line Items]
Total revenue	1,494	1,006	2,110	1,998
Asia Pacific [Member] | Reportable Geographical Components [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 506	$ 1,039	$ 1,089	$ 1,387