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Sale of Future Revenue (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended | 8 Months Ended | 63 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 03, 2020 | Nov. 30, 2020 | Dec. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Payments for loan acquisition costs |  |  |  |  |  | $ 2,909 |  |  |
Revenues |  |  |  | $ 15,345 | $ 21,675 | 26,467 | $ 30,440 |  |
Royalty |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  | (1,034) |  |  |
Marathon Pangolin Royalty LLC | Maximum |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of future revenue | $ 125,000 |  |  |  |  |  |  |  |
License Agreement with Sunovion Pharmaceuticals, Inc. |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 22,000
Minimum annual royalty receivable |  |  |  | $ 1,000 | $ 1,000 | $ 1,000 | $ 1,000 | $ 1,000 | $ 1,000
Guaranteed royalty period |  |  |  |  | 8 years | 8 years |  |  |
License Agreement with Sunovion Pharmaceuticals, Inc. | Royalty |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  | $ 8,000 |  |  |  |
Monetization Agreement |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Effective annual interest rate | 24.90% |  |  |  |  |  |  |  |
Monetization Agreement | Marathon Pangolin Royalty LLC |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of future revenue | $ 40,000 |  | $ 10,000 |  |  |  |  | $ 50,000 |
Proceeds from debt, contingent on additional milestones |  | $ 75,000 |  |  |  |  |  |  |

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