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BUSINESS DEVELOPMENT - Business Combination, Narrative (Details) - Arkis - USD ($) | Jul. 29, 2019 | Dec. 31, 2019
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Business Acquisition [Line Items] |  |
Purchase price of business combination | $ 30,900,000 |
Contingent consideration, liability (up to) | 25,500,000 |
Contingent consideration, fair value | $ 13,100,000 | $ 13,200,000
Acquired intangible assets, discount rate | 14.50% |
Development Milestones |  |
Business Acquisition [Line Items] |  |
Contingent consideration, liability (up to) | $ 10,000,000.0 |
Commercial Sales Milestones |  |
Business Acquisition [Line Items] |  |
Contingent consideration, liability (up to) | $ 15,500,000 |

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