Debt instrument measurement input after change.

No definition available.

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

- Definition

Fair value of financial instruments.

+ References

No definition available.

+ Details

Name:	mnkd_FairValueOfFinancialInstrumentsLineItems
Namespace Prefix:	mnkd_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Note payable, percentage of interest rate change.

+ References

No definition available.

+ Details

Name:	mnkd_NotePayablePercentageOfInterestRateChange
Namespace Prefix:	mnkd_
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

Name:	mnkd_SubstantialPremiumBasedOnFairValuePostModificationRecognizedAsAdditionalPaidInCapital
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
Namespace Prefix:	us-gaap_
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

Name:	us-gaap_CreditFacilityAxis=mnkd_MidCapCreditFacilityMember
Namespace Prefix:
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- Details

Name:	us-gaap_FairValueByMeasurementBasisAxis=us-gaap_CarryingReportedAmountFairValueDisclosureMember
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Data Type:	na
Balance Type:
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- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
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Balance Type:
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- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

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

- 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:
Data Type:	na
Balance Type:
Period Type:

- Details

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

Name:	us-gaap_DebtInstrumentAxis=mnkd_MannGroupNonConvertibleNotesMember
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Fair Value of Financial Instruments - Fair Value of Financial Instruments (Parenthetical) (Detail) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Fair Value Of Financial Instruments [Line Items]
Gain (loss) on extinguishment of debt, net	$ 4,930	$ (17,200)
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%
Financial liabilities fair value	$ 39,600	$ 39,600	$ 55,400
MidCap Credit Facility \| Carrying Value
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	38,700	38,700	49,300
MidCap Credit Facility \| Minimum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	37,600	37,600
MidCap Credit Facility \| Maximum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 41,700	$ 41,700
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%
Gain (loss) on extinguishment of debt, net		$ (22,100)
Substantial premium based on fair value post modification recognized as additional paid-in capital	$ 22,100	$ 22,100
Mann Group Convertible Notes \| Volatility
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of volatility	95	95
Mann Group Convertible Notes \| Minimum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 37,100	$ 37,100
Mann Group Convertible Notes \| Maximum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 39,100	$ 39,100
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%
Financial liabilities fair value	$ 234,700	$ 234,700
Senior Convertible Notes \| Carrying Value
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 223,600	$ 223,600
Senior Convertible Notes \| Volatility
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of volatility	95	95
Senior Convertible Notes \| Minimum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 223,400	$ 223,400
Senior Convertible Notes \| Maximum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	247,100	247,100
Mann Group Convertible Notes
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	38,100	38,100	52,200
Mann Group Convertible Notes \| Carrying Value
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 18,400	$ 18,400	28,000
Mann Group Non Convertible Notes
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value			26,700
Mann Group Non Convertible Notes \| Carrying Value
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value			$ 35,100