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Summary of significant accounting policies - Schedule of Concentrations of Risk (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2018
Accounts Receivable        
Product Information [Line Items]        
Concentration risk percentage   10.00% 10.00%  
Customer Concentration Risk | Revenue | Walmart        
Product Information [Line Items]        
Concentration risk percentage 36.00% 26.00% 31.00% 30.00%
Customer Concentration Risk | Revenue | Target        
Product Information [Line Items]        
Concentration risk percentage 17.00% 22.00% 22.00% 21.00%
Customer Concentration Risk | Accounts Receivable | Walmart        
Product Information [Line Items]        
Concentration risk percentage   33.00% 20.00%  
Customer Concentration Risk | Accounts Receivable | Target        
Product Information [Line Items]        
Concentration risk percentage   17.00% 22.00%  
Customer Concentration Risk | Accounts Receivable | Ulta Beauty        
Product Information [Line Items]        
Concentration risk percentage   11.00%