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Accounting Policies - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Product Information [Line Items] |  |  |  |
Net product sales | $ 23,230,000 | $ 19,965,000 | $ 65,691,000 | $ 68,033,000
Accounting Standards Update 2019-12 |  |  |  |
Product Information [Line Items] |  |  |  |
Change in accounting principle, accounting standards update, adopted | true |  | true |
Change in accounting principle, accounting standards update, immaterial effect | true |  | true |
CINVANTI |  |  |  |
Product Information [Line Items] |  |  |  |
Net product sales | $ 18,000,000.0 | 19,800,000 | $ 56,200,000 | 67,600,000
SUSTOL |  |  |  |
Product Information [Line Items] |  |  |  |
Net product sales | 3,100,000 | 200,000 | 7,400,000 | 400,000
ZYNRELEF |  |  |  |
Product Information [Line Items] |  |  |  |
Net product sales | $ 2,100,000 | $ 0 | $ 2,100,000 | $ 0

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