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Related Party Transactions - Additional Information (Detail)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 15, 2017
USD ($)
TradingDay
$ / shares
shares
Sep. 01, 2017
USD ($)
Jun. 30, 2015
Dec. 24, 2014
Mar. 12, 2013
$ / shares
shares
Jan. 31, 2018
USD ($)
$ / shares
shares
Jan. 31, 2017
USD ($)
Jan. 31, 2018
USD ($)
$ / shares
shares
Jan. 31, 2017
USD ($)
Jul. 31, 2017
USD ($)
$ / shares
shares
Related Party Transaction [Line Items]                    
Preferred stock, shares issued | shares           0   0   0
Preferred stock, par value | $ / shares           $ 0.01   $ 0.01   $ 0.01
Price per share | $ / shares         $ 4.00          
Proceeds from issuance of preferred stock               $ 35,000,000    
Issuance of warrants to acquire additional shares, shares | shares 2,000,000       2,000,000          
Share based compensation expense               7,397,000 $ 381,000  
Series C Convertible Preferred Stock                    
Related Party Transaction [Line Items]                    
Convertible preferred stock conversion price per share | $ / shares $ 1.96                  
Preferred stock, dividend rate, percentage 6.00%                  
Percentage threshold closing sale price of common stock higher than conversion price 170.00%                  
Series C Convertible Preferred Stock | Minimum                    
Related Party Transaction [Line Items]                    
Trading days | TradingDay 5                  
Restricted stock grants and market performance based restricted stock grants [Member]                    
Related Party Transaction [Line Items]                    
Share based compensation expense               6,600,000    
Steel Holdings | Repurchase Agreements | Warrant                    
Related Party Transaction [Line Items]                    
Repurchase price of warrant | $ / shares $ 100                  
Purchase Agreement | SPHG Holdings | Series C Convertible Preferred Stock                    
Related Party Transaction [Line Items]                    
Preferred stock, shares issued | shares 35,000                  
Preferred stock, par value | $ / shares $ 0.01                  
Price per share | $ / shares $ 1,000                  
Proceeds from issuance of preferred stock $ 35,000,000                  
Steel Services Ltd. | Management Services Agreement                    
Related Party Transaction [Line Items]                    
Fixed monthly fee to be paid in consideration of services   $ 95,641               $ 175,000
Total expenses incurred related to Management Services Agreement and Transfer Agreement           $ 400,000 $ 500,000 900,000 $ 1,100,000  
SP Corporate Services Llc and Steel Services Limited | Management Services Agreement                    
Related Party Transaction [Line Items]                    
Amount due to related parties           500,000   $ 500,000   $ 300,000
SP Corporate and Steel Services | Management Services Agreement                    
Related Party Transaction [Line Items]                    
Management services agreement, effective date of agreement       Jan. 01, 2015            
Management services agreement, amended expiration date of agreement     Dec. 31, 2015              
Management services agreement, renew period     1 year              
Management services agreement term               6 months    
Non Employee Directors [Member] | Management Services Agreement | Restricted stock grants and market performance based restricted stock grants [Member]                    
Related Party Transaction [Line Items]                    
Non option equity instruments, granted | shares 5,500,000                  
Share based compensation expense           $ 6,600,000   $ 6,600,000