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Borrowings - Milestone Rights - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Debt Disclosure [Abstract]
Remaining milestone rights liability		$ 7,300	$ 7,300
Payment for milestone liability	$ 5,000
Milestone rights liability — current	1,337	1,337
Milestone rights liability	$ 5,926	$ 5,926

X

- Definition

Milestone rights liabilities current.

+ References

No definition available.

+ Details

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

X

- Definition

Milestone rights liabilities current and noncurrent.

+ References

No definition available.

+ Details

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

X

- Definition

Milestone rights liabilities noncurrent.

+ References

No definition available.

+ Details

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

X

- Definition

Payment for milestone rights liabilities.

+ References

No definition available.

+ Details

Name:	mnkd_PaymentForMilestoneRightsLiabilities
Namespace Prefix:	mnkd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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