Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property, Equipment, and Software (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property, Equipment, and Software (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Property, Plant and Equipment [Line Items]          
General and administrative expenses $ 25,263 $ 306,845 $ 62,061 $ 487,402  
Property and equipment | Minimum          
Property, Plant and Equipment [Line Items]          
Lease life or expected life     3 years   3 years
Property and equipment | Maximum          
Property, Plant and Equipment [Line Items]          
Lease life or expected life     10 years   10 years
Software          
Property, Plant and Equipment [Line Items]          
Lease life or expected life     3 years   3 years