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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Jun. 30, 2019
Dec. 31, 2018
CONDENSED CONSOLIDATED BALANCE SHEETS    
Common stock, par value (in dollars per share) $ 0.0005 $ 0.0005
Common stock, shares authorized 150,000,000 150,000,000
Common stock, shares outstanding 54,385,411 54,385,411