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Royalty Purchase Agreements - Palobiofarma (Details) $ in Thousands |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 26, 2019 USD ($) item | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Agreements |  |  |
Payments to acquire milestones and royalties |  | $ 13,500 |
Long-term royalty receivables |  | 48,075 | $ 34,575
Impairment of long-term royalty receivable |  | 0 | $ 0
Palobiofarma, S.L. | Royalty Purchase Agreement |  |  |
Agreements |  |  |
Number of drug candidates | item | 6 |  |
Payments to acquire milestones and royalties | $ 10,000 |  |
Long-term royalty receivables | 10,000 |  |
Impairment of long-term royalty receivable |  | $ 0 |
Palobiofarma, S.L. | Royalty Purchase Agreement | Silicon Valley Bank Loans |  |  |
Agreements |  |  |
Proceeds from issuance of long-term debt | $ 5,000 |  |

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