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Royalty Purchase Agreements (Tables) | 9 Months Ended
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Sep. 30, 2019
Royalty Purchase Agreement [Abstract] |
Summary of Acquisition of Royalty Rights | The following table summarizes the acquisition of royalty rights as of September 30, 2019 (in thousands):
Balance at December 31, 2018 |  | $ | 15,000 |
Acquisition of royalty rights: |  |  |  |
Bioasis |  |  | 375 |
Aronora |  |  | 9,000 |
Palobiofarma |  |  | 10,000 |
Balance at September 30, 2019 |  | $ | 34,375 |

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- Definition Royalty purchase agreement. + References No definition available. + Details
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- Definition Schedule of royalty rights. + References No definition available. + Details
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Namespace Prefix: | xoma_
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