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Summary of Significant Accounting Policies - Reclassification Activity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Cost of revenue (exclusive of depreciation and amortization) $ 161,560 $ 146,382
Sales and marketing expenses 13,663 11,973
Product development 5,279 2,578
General and administrative expenses $ 36,007 55,094
Previously Reported    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Cost of revenue (exclusive of depreciation and amortization)   140,341
Sales and marketing expenses   16,176
Product development   0
General and administrative expenses   59,510
Category Expansion | Restatement Adjustment    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Cost of revenue (exclusive of depreciation and amortization)   0
Sales and marketing expenses   (1,615)
Product development   2,578
General and administrative expenses   (963)
Operating Costs and Expenses Reclassification | Restatement Adjustment    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Cost of revenue (exclusive of depreciation and amortization)   6,041
Sales and marketing expenses   (2,588)
Product development   0
General and administrative expenses   $ (3,453)