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Income taxes - Net long-term deferred tax liability (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Research & development tax credits | $ 613,003 | $ 166,653
Accrued compensation | 110,092 | 0
Valuation allowances | (496,343) | (43,900)
Deferred Tax Assets, Net of Valuation Allowance | 226,752 | 122,753
Deferred tax liabilities: |  |
Property and equipment | 252,800 | 148,707
Intangible assets | 1,188,009 | 1,380,328
Deferred Tax Liabilities, Gross | 1,440,809 | 1,529,035
Net deferred tax liability | 1,214,057 | 1,406,282
Discontinued Operations |  |
Deferred tax assets: |  |
Operating loss carryforwards - Mexico | 4,296,453 | 3,427,295
Land basis difference - Mexico | 1,262,159 | 1,164,365
Start-up costs - Mexico | 4,904,337 | 4,608,990
Valuation allowances | (10,462,949) | (9,200,650)
Deferred Tax Assets, Net of Valuation Allowance | $ 0 | $ 0

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