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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Jun. 30, 2018
Dec. 31, 2017
Stockholders' equity:    
Common stock, shares authorized 1,000,000,000 1,000,000,000
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, shares issued 160,599,853 149,379,491
Common stock, shares outstanding 160,468,799 149,379,491