Revenue and Deferred Revenue - Summary of Disaggregated Revenue by Sales Channel (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation Of Revenue [Line Items]
Revenue	$ 114,754	$ 95,429	$ 326,444	$ 274,635
Self-serve Revenue
Disaggregation Of Revenue [Line Items]
Revenue	77,134	68,001	223,708	196,506
Enterprise Revenue
Disaggregation Of Revenue [Line Items]
Revenue	$ 37,620	$ 27,428	$ 102,736	$ 78,129

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details