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Summary of significant accounting policies - Reclassification Activity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Cost of revenue (exclusive of depreciation and amortization) $ 49,133 $ 35,757 $ 93,962 $ 73,376
Sales and marketing 3,058 3,167 6,492 6,269
Product development 2,287 1,142 4,445 1,876
General and administrative $ 10,294 8,953 20,329 15,612
Accounts payable     (1,551) (208)
Accrued expenses and other current liabilities     $ (3,762) (2,366)
Previously Reported        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Cost of revenue (exclusive of depreciation and amortization)   33,893   69,556
Sales and marketing   3,678   7,684
Product development   0   0
General and administrative   11,448   19,893
Accounts payable       1,328
Accrued expenses and other current liabilities       (3,902)
Restatement Adjustment        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Accounts payable       (1,536)
Accrued expenses and other current liabilities       1,536
Restatement Adjustment | Category Expansion        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Cost of revenue (exclusive of depreciation and amortization)   0   0
Sales and marketing   (118)   (599)
Product development   1,142   1,876
General and administrative   (1,024)   (1,277)
Restatement Adjustment | Operating Costs and Expenses Reclassification        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Cost of revenue (exclusive of depreciation and amortization)   1,864   3,820
Sales and marketing   (393)   (816)
Product development   0   0
General and administrative   $ (1,471)   $ (3,004)