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Income Taxes - Deferred tax assets (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred Tax Assets: |  |
Net operating loss carryforwards | $ 9,479,512 | $ 5,453,854
Stock-based compensation expense | 943,370 | 616,207
Property and equipment | (14,030) | 2,486
Intangibles | 328,773 | 310,230
Research and development tax credits | 1,584,753 | 1,008,443
Deferred tax assets | 12,322,378 | 7,391,220
Valuation allowance | $ (12,322,378) | (7,391,220)
Deferred tax assets, net |  | $ 0

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