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Related Party Transactions - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 12 Months Ended
Oct. 31, 2012
Dec. 31, 2012
Granite Global Ventures II L.P. and GGV II Entrepreneurs Fund L.P
   
Transactions with Third Party [Line Items]    
Percentage of ownership interest   8.70%
Medium
   
Transactions with Third Party [Line Items]    
Percentage of ownership interest, acquires 33.70%  
Revenue from related parties   $ 6,285
Percentage of total accounts receivable   13.20%