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Royalty Purchase Agreements - Aronora (Details) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 07, 2019 USD ($) item | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
Long-term royalty receivables |  |  | $ 34,375 | $ 15,000
Impairment of long-term royalty receivable |  |  | 0 | 0
Payments to acquire milestones and royalties |  |  | 19,300 | 15,000
Proceeds from issuance of long-term debt |  |  | 9,500 | $ 7,500
Aronora | Non-Bayer Products |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
Number of drug candidates | item | 2 |  |  |
Royalty Purchase Agreement | Aronora |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
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 |  |  |
Long-term royalty receivables | 9,000 |  |  |
Contingent consideration liability | 3,000 |  |  |
Payments of contingent consideration |  | $ 3,000 |  |
Impairment of long-term royalty receivable |  |  | $ 0 |
Aggregate milestones payments per product | 85,000 |  |  |
Royalty Purchase Agreement | Aronora | Silicon Valley Bank Loan Agreement |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
Upfront payment | $ 3,000 |  |  |
Royalty Purchase Agreement | Aronora | Bayer Products |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
Number of drug candidates | item | 3 |  |  |
Number of drug candidates subject to exclusive license option | item | 1 |  |  |
Royalties on net sales of products (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 |  |  |
Royalty Purchase Agreement | Aronora | Non-Bayer Products |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
Non-royalties to be received (as a percent) | 10.00% |  |  |

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