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.