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Borrowings - Schedule of Amortization of Premium and Accretion of Debt Issuance Costs (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Debt Disclosure [Abstract] |  |
Amortization of debt premium |  | $ (1,049)
Amortization of debt discount | $ 268 | 295
Accretion expense — debt issuance cost | $ (101) | $ (111)

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- Definition Amortization of debt discount. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Amortization of debt premium. + References No definition available. + Details
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Namespace Prefix: | mnkd_
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- Definition Amount of amortization expense attributable to debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399 + Details
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- References No definition available. + Details
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