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Restricted cash (Tables)
12 Months Ended
Dec. 31, 2018
Cash and Cash Equivalents [Abstract]  
Schedule of cash and cash equivalents
The following is a reconciliation of cash, cash equivalents and restricted cash as of December 31, 2018 and 2017:
 
As of December 31,
 
2018
 
2017
Cash and cash equivalents
$
1,204,018

 
$
1,659,669

Restricted cash
211,017

 
364,456

Total cash, cash equivalents and restricted cash
$
1,415,035

 
$
2,024,125

Schedule of restricted cash and cash equivalents
The following is a reconciliation of cash, cash equivalents and restricted cash as of December 31, 2018 and 2017:
 
As of December 31,
 
2018
 
2017
Cash and cash equivalents
$
1,204,018

 
$
1,659,669

Restricted cash
211,017

 
364,456

Total cash, cash equivalents and restricted cash
$
1,415,035

 
$
2,024,125