Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) Customer	Mar. 31, 2023	Dec. 31, 2023 USD ($)
Schedule Of Accounting Policies [Line Items]
Number of service providers accounted for more than 10% of revenue | Customer	2
Restructuring charges	$ 1,157
One-time severance charges	3,037
Customer funds held in trust accounts	13,636		$ 6,269
Deferred compensation plan assets	2,470		1,866
Deferred compensation plan liabilities	2,242		2,398
Accumulated deficit	$ (1,023,169)		$ (1,022,160)
ASU No. 2023-01
Schedule Of Accounting Policies [Line Items]
Change in accounting principle, ASU, Adoption date	Jan. 01, 2024
Change in accounting principle, ASU, adopted [true false]	true
Change in accounting principle, ASU, Immaterial effect [true false]	true
Total Revenues | Customer Concentration Risk | One Service Provider
Schedule Of Accounting Policies [Line Items]
Concentration risk percentage	34.00%	27.00%
Total Revenues | Customer Concentration Risk | Second Service Provider
Schedule Of Accounting Policies [Line Items]
Concentration risk percentage	12.00%	21.00%
Accounts Receivable | Customer Concentration Risk | One Service Provider
Schedule Of Accounting Policies [Line Items]
Concentration risk percentage	33.00%		38.00%
Accounts Receivable | Customer Concentration Risk | Second Service Provider
Schedule Of Accounting Policies [Line Items]
Concentration risk percentage	18.00%		12.00%