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Accounts payable, accrued expenses and other liabilities (Tables)
12 Months Ended
Dec. 31, 2019
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 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