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Recent Additions and Expected Return of Product Rights - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 24 Months Ended
--- | --- | --- | --- | ---
Apr. 30, 2019 | Nov. 30, 2018 | Mar. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2021
Business Acquisition [Line Items] |  |  |  |  |  |
Payments for asset acquisitions |  |  | $ 2,300,000 |  |  |
Payment to acquire business upon closing |  |  |  | $ 5,000,000 | $ 0 |
Agreement | Scenario, Forecast |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Financial consideration received in exchange for product license rights |  |  |  |  |  | $ 5,000,000
Level 3 |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Current portion of the contingent consideration liability |  |  |  | 2,200,000 |  |
Noncurrent portion of the contingent consideration liability |  |  |  | 6,400,000 |  |
Vibativ |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Payment to acquire business upon closing |  | $ 20,000,000.0 |  | 20,000,000 |  |
Cash payment during early 2019 | $ 5,000,000.0 |  |  | $ 5,000,000 |  |
Percentage of tiered royalty payments (up to) |  | 20.00% |  |  |  |

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