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Accounts payable, accrued expenses and other liabilities
 6 Months Ended
Jun. 30, 2020
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, 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