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Related Party Transaction - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 13 Months Ended
Oct. 07, 2016
Jan. 31, 2020
Jul. 31, 2021
Jul. 31, 2021
Jul. 31, 2020
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2021
Sep. 30, 2020
Aug. 03, 2020
Aug. 02, 2020
Dec. 18, 2019
Related Party Transaction [Line Items]                        
Maximum number of preferred stock to be issued (in shares)   2,000,000 2,000,000 2,000,000   2,000,000 2,000,000 2,000,000   2,000,000 1,000,000  
Maximum number of common stock to be issued (in shares)   40,000,000 40,000,000 40,000,000   40,000,000 40,000,000 40,000,000   40,000,000 20,000,000  
Common stock, par value (in usd per share)   $ 0.01 $ 0.01 $ 0.01   $ 0.01 $ 0.01 $ 0.01        
Gross proceeds from preferred stock           $ 1,000            
Net proceeds from common stock offering       $ 43 $ 0 $ 3,584 $ 0          
Preferred stock, par value (in usd per share)   $ 1.00 $ 1.00 $ 1.00   $ 1.00 $ 1.00 $ 1.00        
Ladenburg Thalmann & Co. Inc.                        
Related Party Transaction [Line Items]                        
Maximum number of preferred stock to be issued (in shares)                 500,000      
Maximum number of common stock to be issued (in shares)                 5,000,000      
Common stock, par value (in usd per share)                 $ 0.01      
Former CEO                        
Related Party Transaction [Line Items]                        
Interest rate on obligation payable to related party           4.00%            
Outstanding obligation payable to related party, current           $ 968,000   $ 968,000        
Series A Preferred Stock                        
Related Party Transaction [Line Items]                        
Preferred stock, dividend rate           9.00%            
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               500,000     500,000
Percentage of compensation fees to be paid 2.00% 2.00%                    
Stock issued during period (in shares)   994,046,000 163,780,000 184,740,000   44,186,000   994,046,000        
Preferred stock issued from at the market sale of stock program (as a percent)           100.00% 100.00%          
Equity distribution compensation expenses     $ 82,000 $ 92,000   $ 20,408            
Net proceeds from preferred stock     4,000 4,500   1,000            
Preferred stock, dividend rate   9.00%                    
Preferred stock, par value (in usd per share)                       $ 1.00
Series A Preferred Stock | Non-Executive Chairman                        
Related Party Transaction [Line Items]                        
Equity distribution compensation expenses     $ 0 $ 0   $ 0            
Common Stock | Ladenburg Thalmann & Co. Inc.                        
Related Party Transaction [Line Items]                        
Stock issued during period (in shares)     362,000 18,415,000   1,584,556,000            
Equity distribution compensation expenses     $ 1,000 $ 1,000   $ 79,307            
Gross proceeds from common stock           4,000            
Net proceeds from common stock offering     1,000 43,000   3,600            
Common Stock | Non-Executive Chairman                        
Related Party Transaction [Line Items]                        
Equity distribution compensation expenses     $ 0 $ 0   $ 0