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Related Party Transactions - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Maximum [Member]        
Related Party Transaction [Line Items]        
Amount of related party transaction $ 120,000 $ 120,000 $ 120,000 $ 120,000