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Summary of Warrants and Related Information (Detail) - Warrant - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Warrants    
Outstanding 2,000 2,000
Expired/Forfeited (2,000)  
Outstanding   2,000
Weighted Average Exercise Price    
Outstanding $ 66.40 $ 66.40
Expired/Forfeited $ 66.40  
Outstanding   $ 66.40