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Summary of Significant Accounting Policies - Additional Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
Customer
Jun. 30, 2021
Customer
Jun. 30, 2022
USD ($)
Customer
Jun. 30, 2021
Customer
Dec. 31, 2021
USD ($)
Jan. 01, 2022
USD ($)
Schedule Of Accounting Policies [Line Items]            
Number of service providers accounted for more than 10% of revenue | Customer 2 1 2 1    
Customer funds held in trust accounts $ 104,611   $ 104,611   $ 123,643  
Deferred compensation plan assets 1,464   1,464   1,343  
Deferred compensation plan liabilities 1,394   1,394   1,387  
Accumulated deficit $ (923,435)   $ (923,435)   $ (871,922)  
Cumulative Effect Adjustment            
Schedule Of Accounting Policies [Line Items]            
Accumulated deficit           $ 629
Total Revenues | Customer Concentration Risk | Two Service Providers            
Schedule Of Accounting Policies [Line Items]            
Concentration risk percentage 66.00%   59.00%      
Total Revenues | Customer Concentration Risk | One Service Provider            
Schedule Of Accounting Policies [Line Items]            
Concentration risk percentage   49.00%   49.00%    
Accounts Receivable | Customer Concentration Risk | Two Service Providers            
Schedule Of Accounting Policies [Line Items]            
Concentration risk percentage     63.00%   66.00%