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Accounts Receivable - Additional Information (Detail) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2020 Distributor
Receivables [Abstract] |  |
Number of wholesale distributors |  | 3
Percentage of accounts receivable from major wholesale distributors | 87.00% | 87.00%
Percentage of gross sales from major wholesale distributors | 83.00% | 87.00%

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- 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

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- 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

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- Definition Percentage of sales from major customers. + References No definition available. + Details
Name: | mnkd_PercentageOfSalesFromMajorCustomers
Namespace Prefix: | mnkd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration