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Accounts payable, accrued expenses and other liabilities
 6 Months Ended
Jun. 30, 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 June 30, 2019 and December 31, 2018:
 
June 30, 2019
 
December 31, 2018
Accounts payable, accrued expenses and other
$
245,781

 
$
296,523

Deferred revenue
402,007

 
421,542

Accrued interest
254,834

 
262,559

Derivative liabilities (Note 10)
103,778

 
29,321

Operating lease liabilities (Note 15)
54,445

 
—

 
$
1,060,845

 
$
1,009,945