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Business and Basis of Presentation (Additional Information) (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Sep. 30, 2012 | Oct. 13, 2011
Document Information [Line Items] |  |
Year of incorporation | 2003 |
Year of commencement of business | 2005 |
Common Stock Issue price under initial public offering |  | $ 15.00
Conversion of preferred stock into common stock Ratio |  | 1

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