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Accrued Expenses and Other Current Liabilities - Additional Information (Detail) $ in Millions	Mar. 31, 2021 USD ($)
Payables And Accruals [Abstract]
Deferred social security taxes, CARES Act	$ 1.1

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- Definition

Deferred social security taxes CARES act.

+ References

No definition available.

+ Details

Name:	mnkd_DeferredSocialSecurityTaxesCARESAct
Namespace Prefix:	mnkd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_PayablesAndAccrualsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration