Business concentrations - Additional Information (Details)	6 Months Ended
	Jun. 30, 2021
Customer Concentration Risk [Member] | Maximum [Member] | Revenue [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	10.00%
Customer Concentration Risk [Member] | Maximum [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	10.00%
Customer Concentration Risk [Member] | Minimum [Member] | Revenue [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	10.00%
Customer Concentration Risk [Member] | Minimum [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	10.00%
Vendor Concentration Risk [Member] | Maximum [Member] | Product purchases [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	10.00%
Vendor Concentration Risk [Member] | Maximum [Member] | Accounts Payable [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	10.00%
Vendor Concentration Risk [Member] | Minimum [Member] | Product purchases [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	10.00%
Vendor Concentration Risk [Member] | Minimum [Member] | Accounts Payable [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	10.00%