Long-Lived Assets by Geographical Area (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net of accumulated depreciation and amortization	$ 5,026	$ 3,934	$ 2,134
Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net of accumulated depreciation and amortization	3,649	3,101	1,013
EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net of accumulated depreciation and amortization	1,092	420	714
APAC
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net of accumulated depreciation and amortization	$ 285	$ 413	$ 407