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Share-based compensation - Schedule of Share-Based Compensation by Line Item in Consolidated Statements of Operations (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share based compensation expense $ 1,494 $ 1,305 $ 3,437 $ 2,738
Cost of sales [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share based compensation expense (563) 106 (276) 283
Sales and marketing [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share based compensation expense 470 397 906 842
General and administrative [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share based compensation expense 1,530 772 2,705 1,542
Research and development [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share based compensation expense $ 57 $ 30 $ 102 $ 71