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Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
Customer
Segment
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jun. 06, 2022
Sales
Sep. 22, 2021
Sales
Significant Accounting Policies [Line Items]          
Trade receivables, credit period 45 days        
Maturities period 24 months        
Unrealized gain (loss) on held-to-maturity securities $ 100 $ 100      
Number of reportable segments | Segment 1        
Segment Reporting, Expense Information Used by CODM, Description Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated on a regular basis by the chief operating decision-maker, or CODM, in deciding how to allocate resources to an individual segment and in assessing performance of the segment. The Company currently operates in two business segments, U.S. and Europe, which are aggregated into a single reportable segment, for the development and commercialization of VASCEPA. A single management team that reports to the Company’s CODM, who is the Chief Executive Officer, comprehensively manages the business on an integrated basis for the purpose of allocating resources. The Company’s CODM does not currently assess segment performance or allocate resources based on a measure of total assets nor is it practical for the Company to disaggregate assets based on geography. Accordingly, a total asset measure has not been provided for segment disclosure. Accordingly, the Company does not have separately reportable segments.        
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] srt:ChiefExecutiveOfficerMember        
Foreign currency gain (losses) $ 800 (2,600) $ (700)    
Number of sales representatives | Sales       75 300
Restructuring and transformation initiative expense 0 10,972 13,526    
Charges of recognized within Cost of goods sold restructuring inventory 36,474 $ 39,228 18,078    
Organizational Restructuring Plan          
Significant Accounting Policies [Line Items]          
Restructuring and transformation initiative expense $ 11,000        
Comprehensive Cost Reduction Plan          
Significant Accounting Policies [Line Items]          
Restructuring and transformation initiative expense     9,400    
Food and Drug Administration | Discontinued of Business Operations | DE          
Significant Accounting Policies [Line Items]          
Restructuring and transformation initiative expense     $ 4,200    
Short Term Investments          
Significant Accounting Policies [Line Items]          
Maturities period 12 months        
Long Term Investments          
Significant Accounting Policies [Line Items]          
Maturities period 12 months        
Money Market Instruments          
Significant Accounting Policies [Line Items]          
Maturities period 90 days        
Gross Product Sales | Customer Concentration Risk          
Significant Accounting Policies [Line Items]          
Number of customers | Customer 3        
Customer A | Gross Product Sales | Customer Concentration Risk          
Significant Accounting Policies [Line Items]          
Concentration risk percentage 32.00% 36.00%      
Customer A | Accounts Receivable | Customer Concentration Risk          
Significant Accounting Policies [Line Items]          
Concentration risk percentage 25.00% 36.00%      
Customer B | Gross Product Sales | Customer Concentration Risk          
Significant Accounting Policies [Line Items]          
Concentration risk percentage 27.00% 28.00%      
Customer B | Accounts Receivable | Customer Concentration Risk          
Significant Accounting Policies [Line Items]          
Concentration risk percentage 13.00% 18.00%      
Customer C | Gross Product Sales | Customer Concentration Risk          
Significant Accounting Policies [Line Items]          
Concentration risk percentage 30.00% 29.00%      
Customer C | Accounts Receivable | Customer Concentration Risk          
Significant Accounting Policies [Line Items]          
Concentration risk percentage 45.00% 38.00%      
Internal Revenue Service (IRS)          
Significant Accounting Policies [Line Items]          
Open tax year 2018 2019        
Accounting Standards Update 2023-07          
Significant Accounting Policies [Line Items]          
Change in accounting principle, accounting standards update, adopted true        
Change in accounting principle, accounting standards update, adoption date Jan. 01, 2024