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Stock warrants (Details) - Common Stock - $ / shares
Nov. 06, 2020
Oct. 31, 2020
Jan. 31, 2020
Class of Warrant or Right [Line Items]      
Warrants outstanding (in shares)   75,137 75,137
Exercise price (in dollars per share)   $ 8.02 $ 8.02
Subsequent Event      
Class of Warrant or Right [Line Items]      
Warrants exercised (in shares) 75,137    
Shares issued upon conversion of warrants (in shares) 60,388