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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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