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Income taxes - Components of Deferred Taxes (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforward | $ 32,183,004 | $ 20,536,344
Intangible assets |  | 26,842
Stock compensation | 1,358,554 |
Accrued expenses |  | 17,779
Lease liability - ASC 842 | 70,192 | 128,337
Gross deferred tax assets | 33,611,750 | 20,709,302
Valuation allowance | (33,541,533) | (19,676,794)
Total deferred tax assets | 70,217 | 1,032,508
Deferred tax liabilities: |  |
Fixed assets | (1,130) | (1,692)
Stock compensation |  | (908,322)
Right of use asset | (69,087) | (122,494)
Total deferred tax liabilities | $ (70,217) | $ (1,032,508)

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