Nature of Business and Basis of Presentation - Additional Information (Detail)		9 Months Ended
	Apr. 11, 2025	Sep. 30, 2025 USD ($) Segment	Jun. 24, 2025 Country	Dec. 31, 2024 USD ($)
Product Information [Line Items]
Number of countries to develop and commercialize VAZKEPA | Country			59
Number of operating segments | Segment		1
Total assets		$ 659,814,000		$ 685,349,000
Cash and short-term investments		286,600,000
Total current assets		628,334,000		595,399,000
Cash and cash equivalents		122,802,000		121,038,000
Short-term investments		163,785,000		173,182,000
Accounts receivable, net		127,309,000		122,279,000
Current inventory		184,703,000		166,048,000
Long-term inventory		9,106,000		$ 64,740,000
Debt outstanding		$ 0
Ordinary Shares
Product Information [Line Items]
Ratio change on American Depositary Shares, or ADS	20
Effective date of ratio change	Apr. 11, 2025