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Business (Details)
In Thousands, unless otherwise specified
0 Months Ended
Nov. 30, 2012
item
Dec. 08, 2010
Common Stock
Aug. 03, 2011
Ning Xiang
Business      
Ownership interest acquired (as a percent)     51.00%
New common shares issued in initial public offering   6,038  
Number of wholly owned subsidiaries 7