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Commitments and contingencies (Tables)
6 Months Ended
Jun. 30, 2019
Commitments And Contingencies  
Schedule of operating leases

In terms of the lease agreement mentioned above the Company is obligated to make the following minimum undiscounted lease payments:

 

   Amount
    
 Remainder of 2019   $917,930 
 2020    1,882,422 
 2021    1,962,242 
 2022    2,042,062 
 2023 and thereafter    12,436,420 
 Total undiscounted minimum future lease payments   $19,241,076 
Schedule of mortgage loans

The Company is obligated to make the following mortgage loans payments:

 

   Amount
Within one year  $110,815 
One to two years   110,225 
Two to three years   114,903 
Three to four years   3,680,999 
Total  $4,016,942