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Summary of significant accounting policies (Details 2) - shares | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Previously reported |  |  |
Shares issued |  | 5,322,459 | 3,260,559
Restatement |  |  |
Shares issued | 7,899,832 | 7,899,832 |

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- Definition Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-2 + Details
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