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Royalty Purchase Agreements - Agenus (Details) $ in Thousands |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 20, 2018 USD ($) product | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Agreements |  |  |  |  |
Payments to acquire milestones and royalties |  |  | $ 19,300 |  |
Proceeds from issuance of long-term debt |  |  | $ 9,500 |  |
Changes in estimated fair value of contingent consideration |  | $ 0 |  |  |
Long-term royalty receivables |  | 34,375 |  | $ 34,375 | [1]
Impairment of long-term royalty receivable |  | 0 |  | $ 0 |
Royalty Purchase Agreement | Agenus |  |  |  |  |
Agreements |  |  |  |  |
Payments to acquire milestones and royalties | $ 15,000 |  |  |  |
Long-term royalty receivables | 15,000 |  |  |  |
Impairment of long-term royalty receivable |  | $ 0 |  |  |
Royalty Purchase Agreement | Agenus | Silicon Valley Bank Loans |  |  |  |  |
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 |  |  |  |
[1] | The consolidated balance sheet as of December 31, 2019 has been derived from the audited consolidated financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019.

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