Annual report pursuant to Section 13 and 15(d)

Intangible Assets, Net - Future amortization expense of intangible assets (Details)

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Intangible Assets, Net - Future amortization expense of intangible assets (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Intangible Assets, Net    
2021 $ 204,850  
2022 204,850  
2023 204,850  
2024 194,850  
2025 and thereafter 112,747  
Total $ 922,147 $ 464,842