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Income Taxes - Net deferred tax assets (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets: |  |
Stock-based compensation expense | $ 373,602 | $ 73,984
Unrealized losses | 12,990 |
R&D credit carryforward | 3,346,097 | 1,574,596
NOL carryforward | 14,699,524 | 5,525,123
Gross deferred tax assets | 18,432,213 | 7,173,703
Valuation allowance | (17,677,899) | (7,127,448)
Net deferred tax assets | 754,314 | 46,255
Net deferred tax liabilities: |  |
Prepaid expenses deducted for tax | (425,755) | (28,671)
Tax depreciation in excess of book | (328,559) | (17,584)
Total deferred tax liabilities | $ (754,314) | $ (46,255)

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