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FAIR VALUE MEASUREMENTS - Narrative (Details) $ in Millions | 1 Months Ended | 9 Months Ended
--- | --- | ---
May 31, 2018 USD ($) | Jan. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Financial instruments |  |  |  |
Payment of contingent consideration |  |  | $ 10.0 | $ 0.0
Harpoon Medical, Inc. |  |  |  |
Financial instruments |  |  |  |
Payment of contingent consideration |  | $ 10.0 |  |
Valtech |  |  |  |
Financial instruments |  |  |  |
Contingent consideration liability settled with cash and equity | $ 50.0 |  |  |
Discount Rate | Level 3 | Obligations | Minimum |  |  |  |
Financial instruments |  |  |  |
Contingent consideration liability measurement input |  |  | 0.021 |
Discount Rate | Level 3 | Obligations | Maximum |  |  |  |
Financial instruments |  |  |  |
Contingent consideration liability measurement input |  |  | 0.041 |
Probability of Milestone Achievement | Level 3 | Obligations | Minimum |  |  |  |
Financial instruments |  |  |  |
Contingent consideration liability measurement input |  |  | 0.000 |
Probability of Milestone Achievement | Level 3 | Obligations | Maximum |  |  |  |
Financial instruments |  |  |  |
Contingent consideration liability measurement input |  |  | 0.988 |
Volatility of Future Revenue | Level 3 | Obligations |  |  |  |
Financial instruments |  |  |  |
Contingent consideration liability measurement input |  |  | 0.450 |

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