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Condensed Consolidated Balance Sheets (Parenthetical) (unaudited) - $ / shares
Jun. 30, 2019
Dec. 31, 2018
Statement Of Financial Position [Abstract]    
Common stock, par value $ 0.0001 $ 0.0001
Common stock, shares authorized 490,000,000 490,000,000
Common stock, shares issued 36,931,141 36,829,857
Common stock, shares outstanding 36,931,141 36,829,857