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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 10,000,000 10,000,000 10,000,000
Preferred stock, shares issued (in shares) 0 0 0
Preferred stock, shares outstanding (in shares) 0 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 1,000,000,000 1,000,000,000 500,000,000
Common stock, shares issued (in shares) 932,159 263,305 24
Common stock, shares outstanding (in shares) 932,158 263,304 23
Treasury stock, at cost (in shares) 1 1 1
Previously Reported [Member]      
Common stock, shares authorized (in shares)   500,000,000  
Common stock, shares issued (in shares)   228,140  
Common stock, shares outstanding (in shares)   228,139