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Revenue Recognition - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Payment period from distributors received from date of sale |  |  |  |  |  | 45 days |
Net loss per share-basic | [1] | $ (0.06) |  | $ (0.05) |  | $ (0.08) | $ (0.13)
Net loss per share-diluted | [1] | $ (0.06) |  | $ (0.05) |  | $ (0.08) | $ (0.13)
Effect of significant financing component when transfer and customer payment of good or service occurs within one year or less |  |  |  |  |  | true |
Medicaid rebate |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Change in estimate recognized |  |  |  | $ 6.5 |  |  | $ 15.1
Change in net income loss |  |  |  | $ 6.5 |  |  | $ 15.1
Net loss per share-basic |  |  |  | $ (0.06) |  |  | $ (0.17)
Net loss per share-diluted |  |  |  | $ (0.06) |  |  | (0.17)
Exclusion of licensing revenue change in estimate |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Net loss per share-basic |  |  |  |  |  | $ (0.09) | (0.16)
Net loss per share-diluted |  |  |  |  |  | $ (0.09) | $ (0.16)
VASCEPA 1-Gram |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Product expiration date after being converted into capsule form |  |  |  |  |  | 4 years |
VASCEPA 0.5-Gram |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Product expiration date after being converted into capsule form |  |  |  |  |  | 3 years |
Edding |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Adjusted measure of performance and additional license revenue recognized |  |  | $ 4.0 |  | $ 5.0 |  |
HLS |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Adjusted measure of performance and additional license revenue recognized |  |  |  |  | $ 5.3 |  |
Minimum |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Sales discount percentage |  | 2.00% |  |  |  | 2.00% |
Maximum |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Sales discount percentage |  | 3.00% |  |  |  | 3.00% |
[1] | Excluding the licensing revenue change in estimates and Medicaid change in estimate, both discussed in Note 7 – Revenue Recognition, net loss per share, basic and diluted, for the three months ended September 30, 2023 would have been $(0.06) and net loss per share for the nine months ended September 30, 2024 and 2023 would have been $(0.09) and $(0.19), respectively.

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