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Accounts Receivable - Additional Information (Detail) - Distributor | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Receivables [Abstract] |  |  |
Number of wholesale distributors | 3 | 3 | 3
Percentage of accounts receivable from major wholesale distributors | 92.00% | 92.00% | 93.00%

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