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Related party transactions (Tables)
 9 Months Ended
Sep. 30, 2019
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions
Activity with entities considered to be related parties is summarized below: 
 
 
For the three months ended
September 30,
 
For the nine months ended
September 30,
 
 
2019
 
2018
 
2019
 
2018
Franchise revenue
 
$
505

 
$
897

 
$
1,735

 
$
2,453

Equipment revenue
 
883

 
1,472

 
2,325

 
1,782

Total revenue from related parties
 
$
1,388

 
$
2,369

 
4,060

 
$
4,235