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Royalty Purchase Agreements - Bioasis (Details) $ in Thousands |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 02, 2020 USD ($) | Feb. 25, 2019 USD ($) agreement | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Agreements |  |  |  |
Payments to acquire milestones and royalties |  |  | $ 20,500 |
Long-term royalty receivables |  |  | 55,075 | $ 34,575
Contingent consideration under royalty purchase agreements |  |  | 75 | 75
Impairment of long-term royalty receivable |  |  | 0 | $ 0
Bioasis Technologies Inc [Member] | Royalty Purchase Agreement [Member] |  |  |  |
Agreements |  |  |  |
Percentage of option to purchase royalty right on future license agreements |  | 1.00% |  |
Number of future license agreements under optional purchase right | agreement |  | 2 |  |
Obligation upon exercise of options per licensed product, second agreement |  | $ 300 |  |
Obligation upon exercise of options per licensed product, third agreement |  | 400 |  |
Payments to acquire milestones and royalties |  | 300 |  |
Long-term royalty receivables |  | 400 |  |
Contingent consideration under royalty purchase agreements |  | 100 |  |
Changes in estimated fair value of contingent consideration |  |  | 0 |
Payments of contingent consideration |  |  | 0 |
Impairment of long-term royalty receivable |  |  | 0 |
Bioasis Technologies Inc [Member] | Royalty Purchase Agreement [Member] | Maximum [Member] |  |  |  |
Agreements |  |  |  |
Potential future cash payments |  | $ 200 |  |
Bioasis Technologies Inc [Member] | Second Royalty Purchase Agreement |  |  |  |
Agreements |  |  |  |
Payments to acquire milestones and royalties | $ 1,200 |  |  |
Long-term royalty receivables | $ 1,200 |  |  |
Impairment of long-term royalty receivable |  |  | $ 0 |

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