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Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) - $ / shares
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Consolidated Statement of Changes in Stockholders' Equity [Abstract]        
Common stock, par value (in dollars per share) $ 0.001 $ 0.001 $ 0.001 $ 0.001