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Additions and Returns of Product Rights - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended | 24 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 30, 2018 | Nov. 30, 2016 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2021 | Jul. 31, 2020
Business Acquisition [Line Items] |  |  |  |  |  |
Financial consideration received in exchange for product license rights, installment payments |  |  | $ 500,000 | $ 3,000,000.0 |  |
Clinigen | Scenario, Forecast |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Financial consideration received in exchange for product license rights |  |  |  |  | $ 5,000,000 |
Vaprisol |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Payment to acquire business upon closing | $ 20,000,000.0 |  |  |  |  |
Other Payments to Acquire Businesses | $ 5,000,000.0 |  |  |  |  |
Percentage of tiered royalty payments (up to) | 20.00% |  |  |  |  |
Additional liability |  |  | 7,336,045 | 8,200,552 |  |
Vaprisol | Other current liabilities |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Additional liability |  |  | 2,700,000 |  |  |
Vaprisol | Other long-term liabilities |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Additional liability |  |  | 4,600,000 |  |  |
Methotrexate |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Payment to acquire business upon closing |  | $ 100,000 |  |  |  |
Additional liability |  |  |  | $ 1,000,000.0 |  | $ 1,000,000.0
Liability recorded |  | $ 900,000 |  |  |  |
Vested common stock, value |  |  | 900,000 |  |  |
Net intangible assets |  |  | $ 2,800,000 |  |  |
Methotrexate | Restricted Stock |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Unvested restricted shares (in shares) |  | 180,000 |  |  |  |

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