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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 |  |  |  |

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