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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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