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Royalty Purchase Agreements - Viracta (Details) $ in Thousands |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 22, 2021 USD ($) item | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Agreements |  |  |
Payments to acquire milestones and royalties |  | $ 13,500 |
Long-term royalty receivables |  | 48,075 | $ 34,575
Impairment of long-term royalty receivable |  | 0 | $ 0
Viracta | Royalty Purchase Agreement |  |  |
Agreements |  |  |
Number of drug candidates | item | 2 |  |
Maximum amount of potential milestones and other payments receivable | $ 54,000 |  |
Amount of maximum consideration retained | 20,000 |  |
Maximum amount of potential regulatory and commercial milestones receivable | 57,000 |  |
Payments to acquire milestones and royalties | 13,500 |  |
Long-term royalty receivables | $ 13,500 |  |
Impairment of long-term royalty receivable |  | $ 0 |

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- Definition Maximum amount of potential milestones and other payments receivable, excluding consideration retained by company under the terms of the agreement. Excludes regulatory and commercial milestones. + References No definition available. + Details
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