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Accounts payable, accrued expenses and other liabilities (Tables)
6 Months Ended
Jun. 30, 2020
Payables and Accruals [Abstract]  
Schedule of accounts payable, accrued expenses and other liabilities
Accounts payable, accrued expenses and other liabilities consisted of the following as of June 30, 2020 and December 31, 2019:
June 30, 2020December 31, 2019
Deferred revenue$520,466  $389,958  
Accrued interest246,124  255,369  
Accounts payable and accrued expenses220,060  239,086  
Derivative liabilities (Note 11)200,014  97,066  
Operating lease liabilities49,069  51,144  
$1,235,733  $1,032,623