Revenue Recognition - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2021
Disaggregation Of Revenue [Line Items]
Payment period from distributors received from date of sale	30 days
Sales discount percentage	2.00%
Effect of significant financing component when transfer and customer payment of good or service occurs within one year or less	true
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
Minimum
Disaggregation Of Revenue [Line Items]
Payment period from distributors received from date of sale	30 days
Maximum
Disaggregation Of Revenue [Line Items]
Payment period from distributors received from date of sale	60 days