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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%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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