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Summary of significant accounting policies - Concentration of Business and Credit Risk (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2022 USD ($) customer	Mar. 31, 2021 customer	Dec. 31, 2021 customer
Concentration Risk [Line Items]
Federal Depositary Insurance Coverage | $	$ 250,000
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Major Customers [Member]
Concentration Risk [Line Items]
Number of customers	3		2
Concentration risk percentage	46.60%		32.40%
Total Revenue [Member] | Customer Concentration Risk [Member] | Major Customers [Member]
Concentration Risk [Line Items]
Number of customers	2	2
Concentration risk percentage	28.60%	34.50%
Total Purchases [Member] | Supplier Concentration Risk [Member] | Major Supplier [Member]
Concentration Risk [Line Items]
Number of customers	4	3
Concentration risk percentage	84.30%	62.30%

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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.

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Amount of time deposit liabilities, including certificates of deposit, in denominations that meet or exceed the Federal Deposit Insurance Corporation (FDIC) insurance limit.

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