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Royalty Purchase Agreements - Agenus (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Sep. 20, 2018 USD ($) product | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Agreements |  |  |
Payments to acquire milestones and royalties |  | $ 19,300 | $ 15,000
Proceeds from issuance of long-term debt |  | 9,500 | 7,500
Long-term royalty receivables |  | 34,375 | $ 15,000
Royalty Purchase Agreement | Agenus |  |  |
Agreements |  |  |
Payments to acquire milestones and royalties | $ 15,000 |  |
Long-term royalty receivables |  | $ 15,000 |
Royalty Purchase Agreement | Agenus | Silicon Valley Bank Loan Agreement |  |  |
Agreements |  |  |
Proceeds from issuance of long-term debt | $ 7,500 |  |
Royalty Purchase Agreement | Agenus | Incyte Immuno-Oncology Assets |  |  |
Agreements |  |  |
Royalties on net sales of products (as a percent) | 33.00% |  |
Number of licensed products related to milestone and royalties | product | 6 |  |
Purchased percentage of milestones | 10.00% |  |
Royalty Purchase Agreement | Agenus | Merck Immuno-Oncology Product |  |  |
Agreements |  |  |
Royalties on net sales of products (as a percent) | 33.00% |  |
Purchased percentage of milestones | 10.00% |  |
Purchased eligible milestone payments receivable upon achievement of potential development, regulatory and commercial milestones | $ 59,500 |  |

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