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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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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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