Annual report pursuant to Section 13 and 15(d)

Company - Additional Information (Detail)

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Company - Additional Information (Detail)
1 Months Ended 12 Months Ended
Dec. 06, 2010
Aug. 11, 2010
Aug. 17, 2010
Common Stock
Dec. 31, 2010
Common Stock
Organization And Nature Of Business [Line Items]        
Common stock issued in initial public offering 4,000,000 6,000,000   10,000,000
Conversion of preferred stock due to initial public offering, shares     29,567,952 29,568,000