Royalty Purchase Agreements - Summary of Acquisition of Royalty Rights (Details) - USD ($) $ in Thousands |
12 Months Ended | |
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Dec. 31, 2019 |
Dec. 31, 2018 |
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| Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] | ||
| Balance at beginning of period | $ 15,000 | |
| Balance at end of period | 34,375 | $ 15,000 |
| Agenus | ||
| Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] | ||
| Acquisition of royalty rights | $ 15,000 | |
| Bioasis Technologies Inc | ||
| Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] | ||
| Acquisition of royalty rights | 375 | |
| Aronora | ||
| Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] | ||
| Acquisition of royalty rights | 9,000 | |
| Palobiofarma, S.L. | ||
| Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] | ||
| Acquisition of royalty rights | $ 10,000 | |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Long-term royalty receivable non current. No definition available.
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- Definition Royalty rights acquired. No definition available.
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