Debt instrument measurement input after change.

No definition available.

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Namespace Prefix:	mnkd_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Fair value of financial instruments.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Note payable, percentage of interest rate change.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Substantial premium based on fair value post modification recognized as additional paid-in capital.

+ References

No definition available.

+ Details

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Namespace Prefix:	mnkd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Value of input used to measure debt instrument, including, but not limited to, convertible and non-convertible debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

+ Details

Name:	us-gaap_DebtInstrumentMeasurementInput
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Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

+ References

No definition available.

+ Details

Name:	us-gaap_FinancialLiabilitiesFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123467658&loc=d3e12355-112629

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=123467658&loc=d3e12317-112629

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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- Details

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- Details

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Namespace Prefix:
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- Details

Name:	us-gaap_CreditFacilityAxis=mnkd_MannGroupConvertibleNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputPriceVolatilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
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Fair Value of Financial Instruments - Fair Value of Financial Instruments (Parenthetical) (Detail) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Mar. 31, 2021
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of hypothetical yield			9.0
MidCap Credit Facility
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of hypothetical yield	10	10
Note payable, percentage of interest rate increases (decreases)	2.00%	2.00%
Financial liabilities fair value	$ 40.7	$ 40.8
MidCap Credit Facility \| Minimum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	39.0	39.1
MidCap Credit Facility \| Maximum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 42.4	$ 42.7
Mann Group Convertible Notes
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of hypothetical yield	12	12
Note payable, percentage of interest rate increases (decreases)	2.00%	2.00%
Losses on extinguishment of debt		$ (22.1)
Substantial premium based on fair value post modification recognized as additional paid-in capital		$ 22.1
Mann Group Convertible Notes \| Volatility
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of volatility	84.2	85
Mann Group Convertible Notes \| Minimum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 32.8	$ 36.9
Mann Group Convertible Notes \| Maximum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 34.6	$ 38.8
Senior Convertible Notes
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of hypothetical yield	12	12
Note payable, percentage of interest rate increases (decreases)	2.00%	2.00%
Financial liabilities fair value	$ 221.6	$ 237.5
Senior Convertible Notes \| Volatility
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of volatility	83.6	90
Senior Convertible Notes \| Minimum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 211.1	$ 226.6
Senior Convertible Notes \| Maximum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 233.1	$ 249.4