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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 | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 06, 2012 | May 31, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Debt Disclosure [Line Items] |  |  |  |  |
Long-term debt from royalty-bearing instrument, carrying amount net of unamortized discount |  |  | $ 73,732,000 |  | $ 79,710,000
Interest expense, non-cash |  |  | 446,000 | $ 573,000 |
CPPIB |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Maximum repayment of future revenue and receivables |  |  | 80,900,000 |  |
Repayment under agreement |  |  | $ 7,700,000 |  |
CPPIB | Scenario Forecast |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Repayment under agreement |  | $ 7,300,000 |  |  |
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 |  |  |  |
Maximum repayment of future revenue and receivables | 150,000,000 |  |  |  |
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 |  |  | 73,700,000 |  | 79,700,000
Royalty-Bearing Debt | Cash |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Interest expense, contractual coupon interest |  |  | 1,200,000 |  | 1,500,000
Royalty-Bearing Debt | Non Cash |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Interest expense, non-cash |  |  | $ 400,000 |  | $ 500,000

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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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