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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Statement Of Financial Position [Abstract]      
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001 $ 0.001
Preferred stock, authorized 15,000,000 15,000,000 15,000,000
Preferred stock, issued 0 0 0
Preferred stock, outstanding 0 0 0
Common stock, par value (in dollars per share) $ 0.001 $ 0.001 $ 0.001
Common stock, authorized 250,000,000 250,000,000 250,000,000
Common stock, issued 48,471,446 47,671,446 37,341,393
Common stock, outstanding 48,471,446 47,671,446 37,341,393