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FAIR VALUE MEASUREMENTS - Schedule of Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Fair value measurements    
Cash and cash equivalents, and restricted cash $ 315,768 $ 1,491,594
Estimated Fair Value 779,805 937,172
Equity securities 3,336 1,521
Restricted cash    
Fair value measurements    
Cash and cash equivalents, and restricted cash 297 306
Fair Value, Recurring    
Fair value measurements    
Equity securities 3,336 1,521
Non-marketable securities 3,090  
Contingent consideration (359,021) (2,477)
Total 674,842 1,837,816
Fair Value, Recurring | Corporate bonds    
Fair value measurements    
Estimated Fair Value 313,154 132,913
Fair Value, Recurring | U.S. government agency securities    
Fair value measurements    
Estimated Fair Value 249,920 207,171
Fair Value, Recurring | Asset backed securities    
Fair value measurements    
Estimated Fair Value 94,460 7,094
Fair Value, Recurring | Certificates of deposit    
Fair value measurements    
Estimated Fair Value 47,139  
Fair Value, Recurring | Commercial paper    
Fair value measurements    
Estimated Fair Value 6,996  
Fair Value, Recurring | Cash and money market    
Fair value measurements    
Cash and cash equivalents, and restricted cash 247,335 901,294
Fair Value, Recurring | Commercial paper    
Fair value measurements    
Cash and cash equivalents, and restricted cash 64,593  
Fair Value, Recurring | U.S. government agency securities    
Fair value measurements    
Cash and cash equivalents, and restricted cash 3,543 589,994
Fair Value, Recurring | Restricted cash    
Fair value measurements    
Cash and cash equivalents, and restricted cash 297 306
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring    
Fair value measurements    
Equity securities 3,336 1,521
Non-marketable securities 0  
Contingent consideration 0 0
Total 250,968 903,121
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | Corporate bonds    
Fair value measurements    
Estimated Fair Value 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | U.S. government agency securities    
Fair value measurements    
Estimated Fair Value 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | Asset backed securities    
Fair value measurements    
Estimated Fair Value 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | Certificates of deposit    
Fair value measurements    
Estimated Fair Value 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | Commercial paper    
Fair value measurements    
Estimated Fair Value 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | Cash and money market    
Fair value measurements    
Cash and cash equivalents, and restricted cash 247,335 901,294
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | Commercial paper    
Fair value measurements    
Cash and cash equivalents, and restricted cash 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | U.S. government agency securities    
Fair value measurements    
Cash and cash equivalents, and restricted cash 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring | Restricted cash    
Fair value measurements    
Cash and cash equivalents, and restricted cash 297 306
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring    
Fair value measurements    
Equity securities 0 0
Non-marketable securities 0  
Contingent consideration 0 0
Total 779,805 937,172
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Corporate bonds    
Fair value measurements    
Estimated Fair Value 313,154 132,913
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | U.S. government agency securities    
Fair value measurements    
Estimated Fair Value 249,920 207,171
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Asset backed securities    
Fair value measurements    
Estimated Fair Value 94,460 7,094
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Certificates of deposit    
Fair value measurements    
Estimated Fair Value 47,139  
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Commercial paper    
Fair value measurements    
Estimated Fair Value 6,996  
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Cash and money market    
Fair value measurements    
Cash and cash equivalents, and restricted cash 0 0
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Commercial paper    
Fair value measurements    
Cash and cash equivalents, and restricted cash 64,593  
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | U.S. government agency securities    
Fair value measurements    
Cash and cash equivalents, and restricted cash 3,543 589,994
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring | Restricted cash    
Fair value measurements    
Cash and cash equivalents, and restricted cash 0 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring    
Fair value measurements    
Equity securities 0 0
Non-marketable securities 3,090  
Contingent consideration (359,021) (2,477)
Total (355,931) (2,477)
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Corporate bonds    
Fair value measurements    
Estimated Fair Value 0 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | U.S. government agency securities    
Fair value measurements    
Estimated Fair Value 0 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Asset backed securities    
Fair value measurements    
Estimated Fair Value 0 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Certificates of deposit    
Fair value measurements    
Estimated Fair Value 0  
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Commercial paper    
Fair value measurements    
Estimated Fair Value 0  
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Cash and money market    
Fair value measurements    
Cash and cash equivalents, and restricted cash 0 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Commercial paper    
Fair value measurements    
Cash and cash equivalents, and restricted cash 0  
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | U.S. government agency securities    
Fair value measurements    
Cash and cash equivalents, and restricted cash 0 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Restricted cash    
Fair value measurements    
Cash and cash equivalents, and restricted cash $ 0 $ 0