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Summary of significant accounting policies - Deferred Offering Costs (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
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Summary of significant accounting policies |  |
Deferred offering costs | $ 0 | $ 100,000

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- Definition Specific incremental costs directly attributable to a proposed or actual offering of securities which are deferred at the end of the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.A) -URI http://asc.fasb.org/extlink&oid=122040515&loc=d3e105025-122735 + Details
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