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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

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