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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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Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

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Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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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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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.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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