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Segment Information and Concentrations of Risk - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Customer One [Member]
Jun. 30, 2012
Customer Two [Member]
Segment Reporting Information [Line Items]          
Net revenue, percentage 65.00% 63.00% 63.00% 60.00% 11.00%