Information Regarding Net Revenue by Geographic Region (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012		Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Net revenue	$ 26,268	$ 22,945	[1]	$ 70,927	$ 68,007	[1]
Percentage of net revenue	100.00%	100.00%		100.00%	100.00%
Americas
Segment Reporting Information [Line Items]
Net revenue	14,951	13,014		37,275	35,839
Percentage of net revenue	57.00%	57.00%		53.00%	53.00%
Americas | United States
Segment Reporting Information [Line Items]
Net revenue	14,873	12,718		36,816	35,213
Americas | Other
Segment Reporting Information [Line Items]
Net revenue	78	296		459	626
Europe
Segment Reporting Information [Line Items]
Net revenue	8,357	6,653		25,102	22,027
Percentage of net revenue	32.00%	29.00%		35.00%	32.00%
Europe | Other
Segment Reporting Information [Line Items]
Net revenue	2,393	2,497		6,916	7,582
Europe | Germany
Segment Reporting Information [Line Items]
Net revenue	5,964	4,156		18,186	14,445
Asia-Pacific
Segment Reporting Information [Line Items]
Net revenue	2,960	3,278		8,550	10,141
Percentage of net revenue	11.00%	14.00%		12.00%	15.00%
Asia-Pacific | Other
Segment Reporting Information [Line Items]
Net revenue	1,157	1,238		3,534	3,508
Asia-Pacific | Singapore
Segment Reporting Information [Line Items]
Net revenue	$ 1,803	$ 2,040		$ 5,016	$ 6,633

[1] Certain amounts shown in the table above have changed as compared to amounts reported in prior periods as noted in Item 1, Financial Statements, Note 1 of Notes to Condensed Consolidated Financial Statements, Reclassifications and Restatements.