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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Mar. 31, 2019
Dec. 31, 2018
Common stock, par value $ 0.0001 $ 0.0001
Common stock, shares authorized 400,000,000 400,000,000
Common stock, shares issued 92,044,587 91,261,413
Common stock, shares outstanding 91,316,039 91,261,413