Long-Lived Assets by Geographic Location (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Property and equipment, net	$ 5,696	$ 5,888	[1]
Reportable Geographical Components
Segment Reporting Information [Line Items]
Property and equipment, net	5,696	5,888
Reportable Geographical Components | Americas
Segment Reporting Information [Line Items]
Property and equipment, net	1,786	1,694
Reportable Geographical Components | Americas | United States
Segment Reporting Information [Line Items]
Property and equipment, net	1,785	1,693
Reportable Geographical Components | Americas | Other
Segment Reporting Information [Line Items]
Property and equipment, net	1	1
Reportable Geographical Components | Europe
Segment Reporting Information [Line Items]
Property and equipment, net	1,699	1,839
Reportable Geographical Components | Europe | Other
Segment Reporting Information [Line Items]
Property and equipment, net
Reportable Geographical Components | Europe | Germany
Segment Reporting Information [Line Items]
Property and equipment, net	1,699	1,839
Reportable Geographical Components | Asia-Pacific
Segment Reporting Information [Line Items]
Property and equipment, net	2,211	2,355
Reportable Geographical Components | Asia-Pacific | Other
Segment Reporting Information [Line Items]
Property and equipment, net	92	97
Reportable Geographical Components | Asia-Pacific | Singapore
Segment Reporting Information [Line Items]
Property and equipment, net	$ 2,119	$ 2,258

[1] The condensed consolidated balance sheet has been derived from the audited consolidated financial statements at December 31, 2013 but does not include all the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements.