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Summary of significant accounting policies - Reclassification Activity (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Cost of revenue (exclusive of depreciation and amortization) $ 44,829 $ 37,619
Sales and marketing 3,434 3,102
Product development 2,150 734
General and administrative $ 10,043 6,659
Previously Reported    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Cost of revenue (exclusive of depreciation and amortization)   35,663
Sales and marketing   4,006
Product development   0
General and administrative   8,445
Restatement Adjustment | Category Expansion    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Cost of revenue (exclusive of depreciation and amortization)   0
Sales and marketing   (481)
Product development   734
General and administrative   (253)
Restatement Adjustment | Operating Costs and Expenses Reclassification    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Cost of revenue (exclusive of depreciation and amortization)   1,956
Sales and marketing   (423)
Product development   0
General and administrative   $ (1,533)