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Long-term obligations - Additional Information (Details) - USD ($)
3 Months Ended
May 04, 2020
Mar. 31, 2021
Jan. 29, 2021
Vendor Agreement [Member]      
Debt Instrument [Line Items]      
Cost of Goods and Services Sold   $ 400,000  
Paycheck Protection Program Loan [Member]      
Debt Instrument [Line Items]      
Proceeds from Issuance of Debt $ 579,700    
Debt Instrument, Interest Rate, Stated Percentage     100.00%