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Accounts payable, accrued expenses and other liabilities
 12 Months Ended
Dec. 31, 2019
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 December 31, 2019 and 2018:
 
As of December 31,
 
2019
 
2018
Deferred revenue
$
389,958

 
$
421,542

Accrued interest
255,369

 
262,559

Accounts payable and accrued expenses
239,086

 
296,523

Derivative liabilities (Note 11)
97,066

 
29,321

Operating lease liabilities (Note 16)
51,144

 
—

 
$
1,032,623

 
$
1,009,945