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ACQUISITIONS - Harpoon Medical, Inc. (Details) - Harpoon Medical $ in Millions |  | 1 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | --- | ---
Dec. 01, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Nov. 30, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |
Purchase price subject to certain adjustments | $ 119.5 |  |  |
Cash previously paid for cost method investment |  |  |  | $ 16.0
Net proceeds from sale of previous ownership |  |  |  | $ 8.0
Carrying value at acquisition date | 1.5 |  |  |
Remeasurement gain | 6.5 |  |  |
Potential milestone-driven payments |  | $ 150.0 | $ 150.0 |
Period to make additional pre-specified milestone-driven payments |  | 10 years |  |
Liability for estimated fair value of contingent milestone payment |  | $ 59.7 | 59.7 |
Portion of purchase price in escrow | $ 10.0 |  |  |
Escrow fund released period after acquisition | 12 months |  |  |
Acquisition-related costs |  |  | $ 0.4 |
Additional research and development expenditures to be incurred prior to product introduction | $ 41.4 |  |  |
Measurement Input, Discount Rate | Minimum | IPR&D |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Discount rate used to determine fair value | 0.180 |  |  |
Measurement Input, Discount Rate | Maximum | IPR&D |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Discount rate used to determine fair value | 0.190 |  |  |
Harpoon Medical |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Ownership percentage | 6.00% |  |  |

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