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Stock-based Compensation - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 8,761	$ 5,528	$ 25,390	$ 14,951
Capitalized website development and internal-use software costs excluded from stock-based compensation expense	324	89	950	299
Total payments for employees' tax obligations to taxing authorities due to net share settlements	$ 4,192	$ 4,379	$ 12,783	$ 21,867
Class A Common Stock
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Employee tax withholding requirements and option costs due to net share settlement	120,943	93,933	345,114	565,403

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- Definition

Payment of withholding taxes and option costs on net share settlement of restricted stock units and stock options.

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Shares paid for tax withholding and option costs for share-based compensation.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost capitalized for award under share-based payment arrangement.

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