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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Expected Annual Amortization Expense (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Expected annual amortization expense        
2021   $ 1,007,095    
2022   1,007,095    
2023   998,291    
2024   944,368    
2025   841,215    
Thereafter   3,777,171    
Total $ 8,323,460 $ 8,575,235 $ 5,043,021 $ 456,365