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Accounts payable, accrued expenses and other liabilities (Tables)
6 Months Ended
Jun. 30, 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 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