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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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