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Organization - Additional Information (Detail) - shares
Feb. 03, 2019
Sep. 30, 2019
Dec. 31, 2018
Organization And Basis Of Presentation [Line Items]      
Reverse stock split 1-for-10    
Common stock shares of outstanding 10 19,994,560 4,932,723
Common stock shares of issued 10 19,994,560 4,932,723