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Organization - Additional Information (Detail)
6 Months Ended
Jun. 30, 2018
Bank
Oct. 31, 2015
shares
Organization Consolidation And Presentation Of Financial Statements [Abstract]    
Entity incorporation, date of incorporation Jun. 08, 2010  
Sale of additional share of common stock | shares   20,000,000
Number of investment banks to act as financial advisers | Bank 2