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Stockholders' Equity - Stock Option Activities of Stock Option Plans (Parenthetical) (Detail) - shares
Dec. 31, 2015
Dec. 31, 2014
Stockholders Equity [Line Items]    
Shares outstanding at end of year 842,780 955,848
Shares exercisable at end of year 252,925  
Discontinued Operations [Member]    
Stockholders Equity [Line Items]    
Shares outstanding at end of year 211,025  
Shares exercisable at end of year 80,240