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Royalty Purchase Agreements - Aronora (Details) $ in Thousands |  | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 07, 2019 USD ($) item | Sep. 30, 2019 USD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Agreements |  |  |  |
Long-term royalty receivables |  |  | $ 55,075 | $ 34,575
Contingent consideration under royalty purchase agreements |  |  | 75 | 75
Impairment of long-term royalty receivable |  |  | 0 | $ 0
Aronora [Member] | Royalty Purchase Agreement [Member] |  |  |  |
Agreements |  |  |  |
Number of drug candidates | item | 5 |  |  |
Non-royalties to be received (as a percent) | 10.00% |  |  |
Future non-royalty payments to be received (as a percent) | 5.00% |  |  |
Multiplier for cumulative amount of consideration paid | item | 2 |  |  |
Upfront payment | $ 6,000 |  |  |
Threshold amount of cumulative royalties on net sales per product | 250,000 |  |  |
Aggregate milestones payments per product | 85,000 |  |  |
Long-term royalty receivables | 9,000 |  |  |
Contingent consideration under royalty purchase agreements | 3,000 |  | 0 |
Payments of contingent consideration |  | $ 3,000 |  |
Impairment of long-term royalty receivable |  |  | $ 0 |
Aronora [Member] | Royalty Purchase Agreement [Member] | Silicon Valley Bank [Member] |  |  |  |
Agreements |  |  |  |
Upfront payment | $ 3,000 |  |  |
Aronora [Member] | Royalty Purchase Agreement [Member] | Bayer Products [Member] |  |  |  |
Agreements |  |  |  |
Number of drug candidates | item | 3 |  |  |
Number of drug candidates subject to exclusive license option | item | 1 |  |  |
Royalties entity has right to receive (as a percent) | 100.00% |  |  |
Non-royalties to be received (as a percent) | 10.00% |  |  |
Contingent future cash payment for each product | $ 1,000 |  |  |
Potential future cash payments | $ 3,000 |  |  |
Aronora [Member] | Royalty Purchase Agreement [Member] | Non-Bayer Products [Member] |  |  |  |
Agreements |  |  |  |
Number of drug candidates | item | 2 |  |  |
Non-royalties to be received (as a percent) | 10.00% |  |  |

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