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Related Party Transactions - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Related Party Transaction [Line Items]      
Fees paid to related party $ 0 $ 0  
Morrison and Foerster LLP      
Related Party Transaction [Line Items]      
Fees paid to related party     $ 275,000