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Revenue - Summary of Revenue by Digital Experience Platform and Legacy Offering (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation Of Revenue [Line Items]
Total revenue	$ 203,613	$ 156,941	$ 89,133
Digital engagement platform - subscription and other platform
Disaggregation Of Revenue [Line Items]
Total revenue	175,777	121,214	66,286
Digital engagement platform - professional services
Disaggregation Of Revenue [Line Items]
Total revenue	27,702	33,583	14,413
Legacy - subscription and other platform
Disaggregation Of Revenue [Line Items]
Total revenue	99	1,416	6,303
Legacy - professional services
Disaggregation Of Revenue [Line Items]
Total revenue	$ 35	$ 728	$ 2,131

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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