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Commitments and Contingencies - Contingent Consideration (Details) - USD ($) $ in Thousands | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Apr. 07, 2019 | Feb. 25, 2019
Commitments And Contingencies |  |  |  |
Contingent consideration under royalty purchase agreements | $ 75 | $ 75 |  |
Royalty Purchase Agreement [Member] | Bioasis Technologies Inc [Member] |  |  |  |
Commitments And Contingencies |  |  |  |
Contingent consideration under royalty purchase agreements |  |  |  | $ 100
Change in fair value | 0 |  |  |
Royalty Purchase Agreement [Member] | Aronora [Member] |  |  |  |
Commitments And Contingencies |  |  |  |
Contingent consideration under royalty purchase agreements | 0 |  | $ 3,000 |
Royalty Purchase Agreement [Member] | Kuros [Member] |  |  |  |
Commitments And Contingencies |  |  |  |
Contingent consideration under royalty purchase agreements | $ 0 |  |  |

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