Fair Value Measurements - Summary of Assumptions Used to Calculate the Estimated Earnout Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Summary Of Assumptions Used To Calculate Estimated Earnout Liabilities [Line Items]
Estimated earnout liabilities	$ 113,978	$ 34,468
CrowdReason LLC and CorrelationAdvisors
Summary Of Assumptions Used To Calculate Estimated Earnout Liabilities [Line Items]
Year of Acquisition	2021
Earnout Target	Specific revenue growth thresholds through October 2024, a cap of $30.0 million is available; to be settled in cash.
Method	Probability-weighted discounted cash flows and Monte Carlo simulation
Earnout Period	2024
Discount Rate	3.50%
Estimated earnout liabilities	$ 26,320
Track1099 LLC
Summary Of Assumptions Used To Calculate Estimated Earnout Liabilities [Line Items]
Year of Acquisition	2021
Earnout Target	Specific revenue growth thresholds through April 2023, with a cap of $12.5 million; to be settled in cash.
Method	Probability-weighted discounted cash flows and Monte Carlo simulation
Earnout Period	2023
Discount Rate	4.00%
Estimated earnout liabilities	$ 7,880
Davo Technologies LLC
Summary Of Assumptions Used To Calculate Estimated Earnout Liabilities [Line Items]
Year of Acquisition	2021
Earnout Target	Specific revenue growth thresholds through March 2023, with no cap; to be settled in cash.
Method	Probability-weighted discounted cash flows and Monte Carlo simulation
Earnout Period	2023
Discount Rate	7.00%
Estimated earnout liabilities	$ 35,885
Transaction Tax Resources, Inc.
Summary Of Assumptions Used To Calculate Estimated Earnout Liabilities [Line Items]
Year of Acquisition	2020
Earnout Target	Specific revenue growth thresholds through December 2022,with cap of $26.4 million; to be settled in cash.
Method	Probability-weighted discounted cash flows and Monte Carlo simulation
Earnout Period	2022
Discount Rate	15.00%
Estimated earnout liabilities	$ 24,830	15,740
Business Licenses
Summary Of Assumptions Used To Calculate Estimated Earnout Liabilities [Line Items]
Year of Acquisition	2020
Earnout Target	Achievement of certain performance metrics through November 2024, with cap of $20.7 million; to be settled in common stock.
Method	Scenario-based approach
Earnout Period	2024
Discount Rate	4.80%
Estimated earnout liabilities	$ 19,063	$ 18,728