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Long-Term Debt (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2020
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2021
Jul. 31, 2020
Jan. 31, 2021
May 31, 2018
Debt Instrument [Line Items]              
Proceeds from revolving line of credit       $ 0 $ 19,857,000    
Class of warrant or right, exercise price of warrants or rights (in USD per share)             $ 0.62
Class of warrant or right, outstanding (in shares)   0   0   954,884  
Interest expense, long-term debt   $ 500,000 $ 500,000 $ 800,000 $ 800,000    
Class B Common Stock              
Debt Instrument [Line Items]              
Issuance of common stock upon exercise of warrants (in shares)   940,953          
Revolving Credit Facility | Amended Line of Credit              
Debt Instrument [Line Items]              
Line of credit facility, maximum borrowing capacity $ 45,000,000            
Proceeds from revolving line of credit $ 20,000,000