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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Jun. 30, 2019
Dec. 31, 2018
Stockholders' equity (deficit):    
Common stock par value $ 0.001 $ 0.001
Common stock shares authorized 150,000,000 150,000,000
Common stock shares issued 19,867,277 17,345,609
Common stock shares outstanding 19,867,277 17,345,609