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BUSINESS DEVELOPMENT - Asset Acquisition, Narrative (Details) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 09, 2019 USD ($) asset | Jan. 04, 2019 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($)
Schedule Of Asset Acquisition [Line Items] |  |  |  |  |
Research and development |  |  | $ 20,816,000 | $ 18,321,000 |
Rebound |  |  |  |  |
Schedule Of Asset Acquisition [Line Items] |  |  |  |  |
Upfront payment | $ 67,100,000 |  |  |  |
Contingent development milestone payments commitment (up to) | $ 35,000,000.0 |  |  |  |
Number of assets acquired | asset | 1 |  |  |  |
Remaining net assets acquired | $ 7,200,000 |  |  |  |
Development milestone |  |  |  |  | $ 5,000,000.0
In-process research and development |  |  |  |  | $ 5,000,000.0
Research and development |  |  |  | $ 1,700,000 |
Rebound | Cash and Cash Equivalents |  |  |  |  |
Schedule Of Asset Acquisition [Line Items] |  |  |  |  |
Remaining net assets acquired | 2,100,000 |  |  |  |
Rebound | Deferred Tax Asset |  |  |  |  |
Schedule Of Asset Acquisition [Line Items] |  |  |  |  |
Remaining net assets acquired | 4,200,000 |  |  |  |
Rebound | In-Process Research and Development Expense |  |  |  |  |
Schedule Of Asset Acquisition [Line Items] |  |  |  |  |
Upfront payment | $ 59,900,000 |  |  |  |
ISC | Enabling technology license |  |  |  |  |
Schedule Of Asset Acquisition [Line Items] |  |  |  |  |
Upfront payment, intangible assets |  | $ 1,700,000 |  |  |
Option to acquire, period subsequent to first commercial sale |  | 4 years |  |  |
Maximum future purchase price, if circumstances met (not to exceed) |  | $ 80,000,000.0 |  |  |

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