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License and Asset Acquisitions (Tables) | 12 Months Ended
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Dec. 31, 2019
Business Combinations [Abstract] |
Schedule of IPR&D Expense | The Company recorded the following IPR&D expense on the consolidated statements of operations (in thousands):
|  | Years Ended December 31, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
GB002 |  | $ | — |  |  | $ | — |  |  | $ | 5,500 |
GB001 |  |  | — |  |  |  | 19,148 |  |  |  | — |
GB004 |  |  | — |  |  |  | 20,000 |  |  |  | — |
GB1275 |  |  | 1,000 |  |  |  | 7,501 |  |  |  | — |
Other preclinical programs |  |  | 2,600 |  |  |  | 3,010 |  |  |  | — |
Total in process research and development |  | $ | 3,600 |  |  | $ | 49,659 |  |  | $ | 5,500 |

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