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Stock-based Compensation - Summary of Allocation of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | $ 34,301 | $ 20,794 | $ 5,028
Cost of Revenue |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | 354 | 354 | 151
Sales and Marketing Expense |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | 9,989 | 5,111 | 1,911
Product, Technology, and Development Expense |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | 15,159 | 9,865 | 1,637
General and Administrative Expense |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | $ 8,799 | $ 5,464 | $ 1,329

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