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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]      
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) 500,000,000 500,000,000 500,000,000
Common stock, shares issued (in shares) 896,995 228,140 24
Common stock, shares outstanding (in shares) 896,994 228,139 23
Treasury stock, at cost (in shares) 1 1 1