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Nature of Business and Basis of Presentation - Additional Information (Detail)
 9 Months Ended
Sep. 30, 2020
USD ($)
Employee
Segment
Dec. 31, 2019
USD ($)
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]    
Number of operating segments | Segment 1  
Total assets $ 960,203,000 $ 882,209,000
Cash and liquid short-term and long-term investments 608,000,000.0  
Total current assets 888,545,000 855,005,000
Cash and cash equivalents 207,207,000 644,588,000
Short-term investments 354,655,000  
Long-term investments 46,092,000  
Accounts receivable, net 147,292,000 116,430,000
Inventory 148,531,000 76,769,000
Debt from royalty-bearing instrument 9,467,000 $ 50,130,000
Other debt outstanding $ 0  
VASCEPA    
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]    
Debt and future repayments percentage of net product revenues 10.00%  
Sales Representatives and Managers    
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]    
Number of sales professionals | Employee 440  
Sales Representatives    
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]    
Number of sales professionals | Employee 400  
Direct Sales Force    
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]    
Number of sales professionals | Employee 900  
Direct Sales Force And Sales Representatives    
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]    
Number of sales professionals | Employee 800