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Related Party Transaction - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 34 Months Ended
Jul. 31, 2019
Jul. 31, 2019
Jul. 31, 2019
Jan. 31, 2019
Oct. 07, 2016
Related Party Transaction [Line Items]          
Maximum number of preferred stock to be issued (in shares) 1,000,000 1,000,000 1,000,000 1,000,000  
Preferred stock, par value (in usd per share) $ 1.00 $ 1.00 $ 1.00 $ 1.00  
Series A Preferred Stock | Non-Executive Chairman          
Related Party Transaction [Line Items]          
Equity distribution compensation expenses   $ 0      
Series A Preferred Stock | Ladenburg Thalmann & Co. Inc.          
Related Party Transaction [Line Items]          
Maximum number of preferred stock to be issued (in shares)         500,000
Preferred stock dividend rate     9.00%    
Preferred stock, par value (in usd per share)         $ 1.00
Percentage of compensation fees to be paid     2.00%    
Stock issued during period (in shares) 70,282 86,938 423,264    
Gross proceeds from preferred stock $ 1,700,000 $ 2,100,000      
Equity distribution compensation expenses $ 34,000 $ 42,000