Commitments and Contingencies - Annual Purchase Requirements under Amended Contract (Detail) € in Millions	Mar. 31, 2020 EUR (€)
Purchase Obligation Fiscal Year Maturity [Abstract]
2020	€ 6.6
2021	6.6
2022	8.5
2023	10.8
2024	14.6
2025	15.5
2026	€ 19.4

Purchase Obligation Due In Seventh Year

No definition available.

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- Definition

Purchase Obligation Due In Sixth Year

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No definition available.

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Namespace Prefix:	mnkd_
Data Type:	xbrli:monetaryItemType
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- Definition

Minimum amount of purchase arrangement maturing in the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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No definition available.

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Minimum amount of purchase arrangement maturing in the fourth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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No definition available.

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Data Type:	xbrli:monetaryItemType
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- Definition

Minimum amount of purchase arrangement maturing in the second fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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No definition available.

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Minimum amount of purchase arrangement maturing in the third fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- References

No definition available.

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- Definition

Minimum amount of purchase arrangement maturing in the remainder of the fiscal year following the latest fiscal year ended. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant