Basis of preparation - Additional information (Details) - USD ($) shares in Millions			12 Months Ended
Feb. 01, 2021	Jan. 12, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Basis of preparation
Decreased in number ofShares issued and outstanding	13.5	67.5
Cash flow from operating activities			$ 16,339,266	$ 7,948,248	$ 8,553,577
Amount reclassed from cash to restricted cash				$ 1,050,000	$ 1,274,402

The cash flows from (used in) operating activities, which are the principal revenue-producing activities of the entity and other activities that are not investing or financing activities. [Refer: Revenue]

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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