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Accounts Receivable - Additional Information (Detail) - Distributor	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Number of wholesale distributors	3	3
Percentage of accounts receivable from major wholesale distributors	99.00%	89.00%

X

- Definition

Number of wholesale distributors.

+ References

No definition available.

+ Details

Name:	mnkd_NumberOfWholesaleDistributors
Namespace Prefix:	mnkd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of accounts receivable from major customers.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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