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Revenue Recognition - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation Of Revenue [Line Items]
Payment period from distributors received from date of sale				45 days
Net loss per share basic	[1]	$ (0.05)	$ (0.01)	$ (0.13)	$ (0.27)
Net loss per share-diluted	[1]	$ (0.05)	$ (0.01)	$ (0.13)	$ (0.27)
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				(0.16)
Net loss per share-diluted				$ (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]
Additional license revenues		$ 5.0		$ 5.0
HLS
Disaggregation Of Revenue [Line Items]
Additional license revenues		$ 5.3		$ 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 estimate and Medicaid change in estimate, both discussed in Note 7 – Revenue Recognition, net loss per share basic and diluted for the three and nine months ended September 30, 2023 would have been $(0.06) and $(0.19), respectively.

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