Fair Value Measurements - Summary of Assumptions Used to Calculate the Estimated Earnout Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Summary Of Assumptions Used To Calculate Estimated Earnout Liabilities [Line Items]
Estimated earnout liabilities	$ 96,757	$ 113,978
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	5.00%
Estimated earnout liabilities	$ 24,368	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	10.00%
Estimated earnout liabilities	$ 6,570	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	8.00%
Estimated earnout liabilities	$ 34,940	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	$ 11,910	24,830
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	6.20%
Estimated earnout liabilities	$ 18,969	$ 19,063