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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Asset Purchase Agreement    
Liabilities:    
Asset Acquisition, Consideration Transferred, Contingent Consideration $ (1,975)  
Recurring    
Funds held for clients    
Total 19,860 $ 95,122
Liabilities:    
Contingent purchase consideration(1) 4,943 3,880
Total 4,943 3,880
Recurring | Money Market Funds [Member]    
Funds held for clients    
Funds held for clients 2,409 63,999
Recurring | Available-for-sale securities    
Funds held for clients    
Funds held for clients 17,451 25,919
Recurring | Money Market Funds [Member]    
CashEquivalentsAbstract    
Cash and Cash Equivalents, Fair Value Disclosure   5,204
Recurring | Level 1    
Funds held for clients    
Total 2,409 69,203
Liabilities:    
Contingent purchase consideration(1) 0 0
Total 0 0
Recurring | Level 1 | Money Market Funds [Member]    
Funds held for clients    
Funds held for clients 2,409 63,999
Recurring | Level 1 | Available-for-sale securities    
Funds held for clients    
Funds held for clients 0 0
Recurring | Level 1 | Money Market Funds [Member]    
CashEquivalentsAbstract    
Cash and Cash Equivalents, Fair Value Disclosure   5,204
Recurring | Level 2    
Funds held for clients    
Total 17,451 25,919
Liabilities:    
Contingent purchase consideration(1) 0 0
Total 0 0
Recurring | Level 2 | Money Market Funds [Member]    
Funds held for clients    
Funds held for clients 0 0
Recurring | Level 2 | Available-for-sale securities    
Funds held for clients    
Funds held for clients 17,451 25,919
Recurring | Level 2 | Money Market Funds [Member]    
CashEquivalentsAbstract    
Cash and Cash Equivalents, Fair Value Disclosure   0
Recurring | Level 3    
Funds held for clients    
Total 0 0
Liabilities:    
Contingent purchase consideration(1) 4,943 3,880
Total 4,943 3,880
Recurring | Level 3 | Money Market Funds [Member]    
Funds held for clients    
Funds held for clients 0 0
Recurring | Level 3 | Available-for-sale securities    
Funds held for clients    
Funds held for clients $ 0 0
Recurring | Level 3 | Money Market Funds [Member]    
CashEquivalentsAbstract    
Cash and Cash Equivalents, Fair Value Disclosure   $ 0