Borrowings - Milestone Rights - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
Jun. 30, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
Remaining milestone rights liability	$ 5.9	$ 7.3
Payment for milestone liability	5.0
Milestone rights liability, current	$ 1.3

Milestone rights liabilities current and noncurrent.

No definition available.

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