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Related party transactions (Tables)
 12 Months Ended
Dec. 31, 2018
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions
Activity with franchisees considered to be related parties is summarized below.  
 
For the Year Ended
December 31,
 
2018
 
2017
 
2016
Franchise revenue
$
3,179

 
$
2,130

 
$
1,760

Equipment revenue
3,977

 
3,464

 
1,338

Total revenue from related parties
$
7,156

 
$
5,594

 
$
3,098