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Schedule of Authorized And Issued Common Stock And Preferred Stock (Detail) - $ / shares
Dec. 31, 2018
Dec. 31, 2017
Stockholders Equity Note [Abstract]    
Common stock shares authorized 125,000,000 125,000,000
Common stock par value $ 0.001 $ 0.001
Common stock shares issued 36,978,280 22,115,916
Preferred stock shares authorized 3,000,000 3,000,000
Preferred stock par value