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Shareholders' Equity - Additional Information (Detail) - $ / shares
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Class of Stock [Line Items]    
Preferred stock, shares authorized 1,000,000 1,000,000
Preferred stock, par value $ 1.00 $ 1.00
Warrant [Member] | Assumed In Acquisition [Member]    
Class of Stock [Line Items]    
Exercise price of each class of warrants or rights outstanding $ 518.18  
Warrant to purchase common stock 95,525  
Warrants, date of expiration Dec. 12, 2018