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Additions and Returns of Product Rights - Narrative (Details) - USD ($) shares in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 24 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2019 | Nov. 30, 2018 | Nov. 30, 2016 | Jun. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Payment to acquire business upon closing |  |  |  |  | $ 0 | $ 5,000,000 |  |  |
Clinigen |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  | 5,300,000 |  |  |
Direct expenses |  |  |  |  |  | 3,400,000 |  |  |
Discontinued operations income |  |  |  |  | 1,500,000 | $ 1,900,000 |  |  |
Inventory |  |  |  |  |  |  |  |  | $ 500,000
Clinigen | Scenario, Forecast |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Financial consideration received in exchange for product license rights |  |  |  |  |  |  | $ 5,000,000 |  |
Nordic |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  |  |  | $ 500,000 |  |  |  |  |
Vibativ |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Payment to acquire business upon closing |  | $ 20,000,000.0 |  |  | 20,000,000 |  |  |  |
Cash payment during 2019 | $ 5,000,000.0 |  |  |  | 5,000,000 |  |  |  |
Percentage of tiered royalty payments (up to) |  | 20.00% |  |  |  |  |  |  |
Additional liability |  |  |  | 8,300,562 | 8,300,562 |  |  |  | $ 8,633,589
Vibativ | Other current liabilities |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Additional liability |  |  |  | 2,800,000 | 2,800,000 |  |  |  |
Vibativ | Other long-term liabilities |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Additional liability |  |  |  | $ 5,500,000 | 5,500,000 |  |  |  |
Methotrexate |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Payment to acquire business upon closing |  |  | $ 100,000 |  |  |  |  |  |
Liability recorded |  |  | $ 900,000 |  |  |  |  |  |
Vested common stock, value |  |  |  |  | $ 900,000 |  |  |  |
Methotrexate | Subsequent Event |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Additional liability |  |  |  |  |  |  |  | $ 1,000,000.0 |
Methotrexate | Restricted Stock |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Unvested restricted shares (in shares) |  |  | 180 |  |  |  |  |  |

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