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FAIR VALUE MEASUREMENT AND FINANCIAL INSTRUMENTS - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Liabilities: |  |
Contingent consideration - short term | $ 0 | $ 8,985
Contingent consideration - long term | 56,600 | 99,855
Recurring | Quoted Prices in Active Markets (Level 1) |  |
Assets: |  |
Money market funds (cash equivalents) | 16,380 | 16,374
Liabilities: |  |
Contingent consideration - short term | 0 | 0
Contingent consideration - long term | 0 | 0
Recurring | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Money market funds (cash equivalents) | 0 | 0
Liabilities: |  |
Contingent consideration - short term | 0 | 0
Contingent consideration - long term | 0 | 0
Recurring | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Money market funds (cash equivalents) | 0 | 0
Liabilities: |  |
Contingent consideration - short term | 0 | 8,985
Contingent consideration - long term | 56,600 | 99,855
Carrying Amount | Recurring |  |
Assets: |  |
Money market funds (cash equivalents) | 16,380 | 16,374
Liabilities: |  |
Contingent consideration - short term | 0 | 8,985
Contingent consideration - long term | 56,600 | 99,855
Fair Value | Recurring |  |
Assets: |  |
Money market funds (cash equivalents) | 16,380 | 16,374
Liabilities: |  |
Contingent consideration - short term | 0 | 8,985
Contingent consideration - long term | $ 56,600 | $ 99,855

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