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Subsequent Events - Additional Information (Detail) - Subsequent Event [Member]
1 Months Ended
Jul. 27, 2017
shares
Series B Preferred Stock [Member]  
Subsequent Event [Line Items]  
Conversion of Stock, Shares Converted 6,558,345
Common Stock [Member]  
Subsequent Event [Line Items]  
Conversion of Stock, Shares Issued 41,842,241