Long-Lived Assets by Geographic Location (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Property and equipment, net	$ 8,837	$ 8,892	[1]
Americas
Segment Reporting Information [Line Items]
Property and equipment, net	1,658	1,072
Americas | United States
Segment Reporting Information [Line Items]
Property and equipment, net	1,657	1,071
Americas | Other
Segment Reporting Information [Line Items]
Property and equipment, net	1	1
Europe
Segment Reporting Information [Line Items]
Property and equipment, net	4,704	4,913
Europe | Other
Segment Reporting Information [Line Items]
Property and equipment, net	347	412
Europe | Germany
Segment Reporting Information [Line Items]
Property and equipment, net	3,278	3,378
Europe | Netherlands
Segment Reporting Information [Line Items]
Property and equipment, net	1,079	1,123
Asia-Pacific
Segment Reporting Information [Line Items]
Property and equipment, net	2,475	2,907
Asia-Pacific | Other
Segment Reporting Information [Line Items]
Property and equipment, net	110	108
Asia-Pacific | Singapore
Segment Reporting Information [Line Items]
Property and equipment, net	$ 2,365	$ 2,799

[1] The condensed consolidated balance sheet has been derived from the audited consolidated financial statements at December 31, 2012 but does not include all the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements.