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Debt - Long-Term Debt from Royalty-Bearing Instrument-December 2012 Financing - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended	9 Months Ended
	Dec. 06, 2012	Nov. 30, 2020	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Debt Disclosure [Line Items]
Long-term debt from royalty-bearing instrument, carrying amount net of unamortized discount			$ 9,387,000	$ 9,387,000		$ 49,702,000
Interest expense, non-cash				601,000	$ 1,282,000
CPPIB
Debt Disclosure [Line Items]
Maximum repayment of future revenue and receivables			9,600,000	9,600,000
Interest repayment on future revenue and receivables			100,000	100,000
Repayment under agreement			13,400,000	$ 42,800,000
CPPIB | Scenario Forecast
Debt Disclosure [Line Items]
Repayment under agreement		$ 9,600,000
VASCEPA
Debt Disclosure [Line Items]
Debt and future repayments percentage of net product revenues				10.00%
VASCEPA | CPPIB
Debt Disclosure [Line Items]
Debt and future repayments percentage of net product revenues				10.00%
BioPharma Debt
Debt Disclosure [Line Items]
Amount received at the closing of the agreement	$ 100,000,000.0
Maximum repayment of future revenue and receivables	$ 150,000,000.0
Royalty-Bearing Debt
Debt Disclosure [Line Items]
Gain (loss) on change in fair value of derivative liabilities				$ 0	0
Long-term debt from royalty-bearing instrument, carrying amount net of unamortized discount			$ 9,400,000	9,400,000		$ 49,700,000
Royalty-Bearing Debt | Cash
Debt Disclosure [Line Items]
Interest expense, contractual coupon interest				1,500,000	3,400,000
Royalty-Bearing Debt | Non Cash
Debt Disclosure [Line Items]
Interest expense, non-cash				$ 600,000	$ 1,300,000

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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