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FAIR VALUE MEASUREMENTS - Schedule of Financial Instruments (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Assets:    
Cash equivalents   $ 105,396,000
Liabilities:    
Contingent consideration arrangements $ 12,200,000 0
Quoted Market Prices for Identical Assets in Active Markets (Level 1)    
Assets:    
Cash equivalents   104,852,000
Liabilities:    
Contingent consideration arrangements 0  
Significant Other Observable Inputs (Level 2)    
Assets:    
Cash equivalents   544,000
Liabilities:    
Contingent consideration arrangements 0  
Significant Unobservable Inputs (Level 3)    
Assets:    
Cash equivalents   0
Liabilities:    
Contingent consideration arrangements 12,200,000  
Money market funds    
Assets:    
Cash equivalents 305,836,000 104,852,000
Money market funds | Quoted Market Prices for Identical Assets in Active Markets (Level 1)    
Assets:    
Cash equivalents 305,836,000 104,852,000
Money market funds | Significant Other Observable Inputs (Level 2)    
Assets:    
Cash equivalents 0 0
Money market funds | Significant Unobservable Inputs (Level 3)    
Assets:    
Cash equivalents $ 0 0
Time deposits    
Assets:    
Cash equivalents   544,000
Time deposits | Quoted Market Prices for Identical Assets in Active Markets (Level 1)    
Assets:    
Cash equivalents   0
Time deposits | Significant Other Observable Inputs (Level 2)    
Assets:    
Cash equivalents   544,000
Time deposits | Significant Unobservable Inputs (Level 3)    
Assets:    
Cash equivalents   $ 0