Accounts Receivable - Additional Information (Detail) - Distributor	9 Months Ended	12 Months Ended
Sep. 30, 2019	Dec. 31, 2018
Receivables [Abstract]
Number of wholesale distributors	3	3
Percentage of accounts receivable from major wholesale distributors	98.00%	89.00%

Percentage of accounts receivable from major customers.

No definition available.

Name:	mnkd_PercentageOfAccountsReceivableFromMajorCustomers
Namespace Prefix:	mnkd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant