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Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2017
Dec. 31, 2016
Statement Of Financial Position [Abstract]    
Common stock, par value $ 0.001 $ 0.001
Common stock, authorized 150,000,000 400,000,000
Common stock, issued 2,134,154 2,224,384
Common stock, outstanding 2,134,154 2,224,384