Information Regarding Net Revenue by Geographic Region (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Net revenue	$ 17,160	$ 15,955
Percentage of net revenue	100.00%	100.00%
Americas
Segment Reporting Information [Line Items]
Net revenue	8,618	8,059
Percentage of net revenue	50.00%	51.00%
Americas | United States
Segment Reporting Information [Line Items]
Net revenue	8,618	8,059
Europe and the Middle East
Segment Reporting Information [Line Items]
Net revenue	4,698	4,753
Percentage of net revenue	27.00%	30.00%
Europe and the Middle East | Germany
Segment Reporting Information [Line Items]
Net revenue	4,698	4,753
Asia-Pacific
Segment Reporting Information [Line Items]
Net revenue	$ 3,844	$ 3,143
Percentage of net revenue	23.00%	19.00%