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Acquisitions - Censa Acquisition (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
May 29, 2020 | Dec. 31, 2020 | Dec. 31, 2018
Acquisitions |  |  |
Issuance of common stock related to acquisition |  | $ 42,869 | $ 155,860
Censa |  |  |
Acquisitions |  |  |
Payments for asset acquisitions | $ 15,000 |  |
Payments for asset acquisitions, upfront payment | 10,400 |  |
Payments for asset acquisitions, net assets | $ 4,600 |  |
Issuance of common stock related to acquisition (in shares) | 845,364 |  |
Issuance of common stock related to acquisition | $ 42,900 |  |
Acquisition costs | 700 |  |
Total consideration | 58,600 |  |
Fair value of net assets acquired | 4,600 |  |
Asset acquisition, cash and cash equivalents | 3,800 |  |
Asset acquisition, other current assets | 800 |  |
Asset acquisition, in-process research and development | 54,000 |  |
Asset acquisition, development and regulatory milestones | 109,000 |  |
Asset acquisition, initial milestone | 30,000 |  |
Censa | Maximum |  |  |
Acquisitions |  |  |
Asset acquisition, milestone, amount | 217,500 |  |
Asset acquisition, net sales milestone | $ 160,000 |  |
Censa | Research and development |  |  |
Acquisitions |  |  |
Asset acquisition, research and development expense |  | 53,300 |
Censa | Selling, general and administrative |  |  |
Acquisitions |  |  |
Acquisition costs |  | $ 700 |

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