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Related party transactions (Tables)
 6 Months Ended
Jun. 30, 2018
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
June 30,
 
For the six months ended
June 30,
 
 
2018
 
2017
 
2018
 
2017
Franchise revenue
 
$
813

 
$
382

 
$
1,557

 
$
830

Equipment revenue
 
323

 
554

 
323

 
573

Total revenue from related parties
 
$
1,136

 
$
936

 
1,880

 
$
1,403