Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue from contracts with customers (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue from contracts with customers (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Deferred revenue for remaining unsatisfied performance obligations $ 2,561,912 $ 1,546,712
Amount of recognized revenue that was included in the deferred revenue balance at the beginning of the period $ 758,794 $ 2,905,691