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Taxes - Components of deferred tax assets and liabilities (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets: |  |
Allowance for doubtful accounts and other markdown and impairments | $ 7,622,322 | $ 4,464,601
Valuation allowance | (7,622,322) | (4,464,601)
Total | 0 | 0
Deferred tax liability: |  |
Increase in fair value of intangible assets acquired through acquisition | 2,129,517 | 1,905,442
Impairment of intangible assets acquired through acquisition | (2,129,517) | (1,905,442)
Total | $ 0 | $ 0

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