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Royalty Purchase Agreements - Bioasis (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 25, 2019 USD ($) agreement | Sep. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Agreements |  |  |  |  |  |
Payments to acquire milestones and royalties |  |  |  | $ 19,300 |  |
Contingent consideration under royalty purchase agreements |  | $ 75 | $ 75 |  | $ 75 | [1]
Long-term royalty receivables |  | 34,375 | 34,375 |  | 34,375 | [1]
Changes in estimated fair value of contingent consideration |  |  | 0 |  |  |
Payments of contingent consideration |  | $ 0 | 0 |  |  |
Impairment of long-term royalty receivable |  |  | 0 |  | $ 0 |
Bioasis Technologies Inc | Royalty Purchase Agreement |  |  |  |  |  |
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 |  |  |  |  |
Contingent consideration under royalty purchase agreements | 100 |  |  |  |  |
Long-term royalty receivables | 400 |  |  |  |  |
Impairment of long-term royalty receivable |  |  | $ 0 |  |  |
Bioasis Technologies Inc | Royalty Purchase Agreement | Maximum |  |  |  |  |  |
Agreements |  |  |  |  |  |
Potential future cash payments | $ 200 |  |  |  |  |
[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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