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Revenue - Deferred revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Annual dues    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Term over which revenue is ratably recognized   12 months
Balance at beginning of period   $ 15,297
New billings   28,249
Revenue recognized   (26,775)
Balance at the end of period $ 16,771 16,771
Revenue recognized 2,400 13,400
Franchise sales revenue    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Balance at beginning of period   27,943
New billings   6,083
Revenue recognized   (6,896)
Balance at the end of period 27,130 27,130
Revenue recognized $ 1,900 $ 5,700