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Summary of significant accounting policies (Details 4) - shares | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Previously reported |  |  |  |
Shares issued | 5,322,459 | 3,260,559 | 3,260,559 | 2,229,609
Restatement |  |  |  |
Shares issued | 7,899,832 | 7,899,832 | 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 -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21463-112644 + Details
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