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Licenses, Asset Acquisitions and Contingent Consideration - Schedule of IPR&D Expense (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Total in process research and development | $ 20,000 | $ 275 | $ 0 | $ 18,080 | $ 2,000
GB001 |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Total in process research and development |  | 0 | 0 | 0 | 0
GB002 |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Total in process research and development |  | 0 | 0 | 0 | 0
GB004 |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Total in process research and development |  | 275 | 0 | 15,275 | 0
GB1275 |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Total in process research and development |  | 0 | 0 | 0 | 1,000
Other Programs |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Total in process research and development |  | $ 0 | $ 0 | $ 2,805 | $ 1,000

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