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Accounts payable, accrued expenses and other liabilities
 6 Months Ended
Jun. 30, 2022
Payables and Accruals [Abstract]  
Accounts payable, accrued expenses and other liabilities Accounts payable, accrued expenses and other liabilities
Accounts payable, accrued expenses and other liabilities consisted of the following as of June 30, 2022 and December 31, 2021:
June 30, 2022December 31, 2021
Deferred revenue$538,532 $510,715 
Accounts payable and accrued expenses730,744 850,215 
Accrued interest353,936 352,374 
Operating lease liabilities165,385 173,595 
Derivative liabilities (Note 13)1,325 71,197 
$1,789,922 $1,958,096