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Commitments and Contingencies - Additional Information (Detail) € in Millions	3 Months Ended	24 Months Ended
	Mar. 31, 2017 EUR (€)	Oct. 01, 2018 USD ($)	Mar. 31, 2017 USD ($)	Jul. 01, 2013 USD ($)
Commitments and Contingencies [Line Items]
Purchase commitment amount under Insulin Supply Agreement | €	€ 93.0
Supply Agreement expiration period	Dec. 31, 2023
Supply Agreement renewal period	2 years
Scenario Forecast
Commitments and Contingencies [Line Items]
Purchase commitment cancellation fees		$ 3,400,000
Scenario Forecast | Before Amendment
Commitments and Contingencies [Line Items]
Purchase commitment cancellation fees		$ 5,300,000
Supply Commitment
Commitments and Contingencies [Line Items]
Purchase commitment obligation			$ 800,000
Deerfield | Milestone Rights Liability | Maximum
Commitments and Contingencies [Line Items]
Contingent liability for milestone payments			$ 90,000,000	$ 90,000,000

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- Definition

Commitments and Contingencies [Line Items]

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- Definition

Contingent Liability

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- Definition

Long Term Purchase Commitment Cancellation Fees

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No definition available.

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- Definition

Long Term Purchase Commitment, Expiration Date

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- Definition

Long-term purchase commitment, renewal time period.

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- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

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No definition available.

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- Definition

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

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No definition available.

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