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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 | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 06, 2012 | Aug. 31, 2019 | Jun. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Debt Disclosure [Line Items] |  |  |  |  |  |
Long-term debt from royalty-bearing instrument, carrying amount net of unamortized discount |  |  | $ 68,054,000 | $ 68,054,000 |  | $ 79,710,000
Interest expense, non-cash |  |  |  | 878,000 | $ 1,140,000 |
CPPIB |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |
Maximum repayment of future revenue and receivables |  |  | 73,600,000 | 73,600,000 |  |
Repayment under agreement |  |  | 7,300,000 | $ 15,000,000.0 |  |
CPPIB | Scenario Forecast |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |
Repayment under agreement |  | $ 10,000,000.0 |  |  |  |
CPPIB | Vascepa |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |
Debt and future repayments percentage of net 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] |  |  |  |  |  |
Fair value of embedded derivative liability | $ 14,600,000 |  |  |  |  |
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 |  |  | $ 68,100,000 | 68,100,000 |  | $ 79,700,000
Royalty-Bearing Debt | Cash |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |
Interest expense, contractual coupon interest |  |  |  | 2,400,000 | 3,000,000.0 |
Royalty-Bearing Debt | Non Cash |  |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |  |
Interest expense, non-cash |  |  |  | $ 900,000 | $ 1,000,000.0 |

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