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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2018
Dec. 31, 2017
Statement Of Financial Position [Abstract]    
Common stock, par value $ 0.0001 $ 0.0001
Common stock, shares authorized 500,000,000 500,000,000
Common stock, shares issued 79,088,200 79,021,878
Common stock, shares outstanding 79,088,200 79,021,878