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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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