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Borrowings - Facility Financing Obligation (2019 Notes and Tranche B Notes) - Additional Information (Detail) |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
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Sep. 26, 2018 USD ($) | Sep. 05, 2018 USD ($) shares | Jul. 12, 2018 USD ($) $ / shares shares | Jun. 08, 2018 USD ($) $ / shares shares | Mar. 12, 2018 USD ($) shares | Mar. 06, 2018 USD ($) d $ / shares shares | Jan. 18, 2018 USD ($) d $ / shares shares | Jan. 15, 2018 USD ($) | Nov. 06, 2017 USD ($) $ / shares shares | Oct. 23, 2017 USD ($) d $ / shares shares | Jun. 29, 2017 USD ($) $ / shares shares | Apr. 18, 2017 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) | Aug. 31, 2018 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) | Oct. 31, 2018 USD ($) | Oct. 16, 2018 USD ($) | Sep. 07, 2018 $ / shares | Sep. 06, 2018 $ / shares | Jun. 07, 2018 USD ($) $ / shares | Mar. 09, 2018 $ / shares
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 101,700,000 |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 765,000 | $ 1,611,000 | $ (72,024,000) |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 71,157,000 | $ 43,946,000 |  |  |  |  |  |  |
Common stock, shares issued | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 187,029,967 | 119,053,414 |  |  |  |  |  |  |
Milestone rights liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,201,000 | $ 7,201,000 |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold in underwritten public offering | shares |  |  |  |  |  |  |  |  |  | 973,236 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deerfield |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion Option, shares | shares |  |  |  | 3,061,224 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange price per share | $ / shares |  |  | $ 1.80 | $ 1.96 |  |  |  |  |  |  |  | $ 1.15 |  |  |  |  |  |  |  |  | $ 1.78 | $ 2.04 |  |
Loss on extinguishment of debt |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  | $ 700,000 |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  | $ 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt discount and issuance costs |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued | shares |  |  | 7,367,839 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, payment terms description |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | further defer the payment of $3.0 million in principal amount of 2019 notes from September 30, 2018 until the earlier of October 31, 2018 or the first business day following the date the Company receives an upfront payment of $45.0 million from UT |  |  |  |  |  |  |  |
Available amount of credit facility under covenant restrictions for each quarter end after current fiscal | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000 |  |  |  |  |  |  |  |
Deerfield | United Therapeutics Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront payment received |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 45,000,000 |  |  |  |
Deerfield | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000 |
Available amount of credit facility under covenant restrictions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  | $ 20,000,000 |  |  |  |  |
Deerfield | Minimum | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of shares | $ / shares |  |  | $ 1.80 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deerfield | Maximum | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion Option, shares | shares |  |  | 5,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of shares | $ / shares |  |  | $ 2.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,000,000 | 39,400,000 |  |  |  |  |  |  |
Senior notes, effective interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.75% |  |  |  |  |  |  |  |
Conversion of notes to common shares, value |  |  |  |  |  | $ 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange price per share | $ / shares |  |  |  |  |  | $ 2.83 |  |  |  |  | $ 1.45 |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt extinguishment amount |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt discount and issuance costs |  |  |  |  |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 notes | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion Option, shares | shares |  |  |  |  |  | 441,618 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 notes | Deerfield |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes, effective interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.75% |  |  |  |  |  |  |  |
Cash repayment of senior notes under exchange agreement | $ 3,000,000 |  |  |  |  |  |  |  |  |  | 10,000,000 |  | $ 3,000,000 | $ 3,000,000 |  |  |  |  |  |  |  |  |  |
Conversion of notes to common shares, value |  | 8,000,000 |  |  |  |  |  |  |  |  | $ 5,000,000 | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Conversion Option, shares | shares |  |  |  |  |  |  |  |  |  |  | 3,584,230 | 4,347,826 |  |  |  |  |  |  |  |  |  |  |  |
Exchange price per share | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 1.395 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2019 notes | Deerfield | 2019 Notes Due And Payable On July 1, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of notes to common shares, value |  |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 notes | Deerfield | Notes Due and Payable on July 18, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of notes to common shares, value |  |  | 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 notes | Deerfield | Notes Due And Payable On December312019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of notes to common shares, value |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 notes | Deerfield | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  | $ 25,000,000 |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |
Tranche B notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,500,000 | 15,000,000 |  |  |  |  |  |  |
Senior notes, effective interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.75% |  |  |  |  |  |  |  |
Tranche B notes | Deerfield |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes, effective interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.75% |  |  |  |  |  |  |  |
Cash repayment of senior notes under exchange agreement |  |  |  |  |  |  |  |  |  |  |  | $ 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Conversion of notes to common shares, value |  | $ 2,500,000 |  |  | $ 5,000,000 |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Conversion Option, shares | shares |  |  |  |  | 1,838,236 |  |  |  |  |  |  | 869,565 |  |  |  |  |  |  |  |  |  |  |  |
Exchange price per share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.72
Tranche B notes | Deerfield | Tranche B Notes Due and Payable on December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of notes to common shares, value |  |  |  | $ 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tranche B notes | Deerfield | Notes Due And Payable On December312019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of notes to common shares, value |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Financing Obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,495,000 | 54,407,000 |  |  |  |  |  |  |
Principal repayment schedule, start date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 01, 2016 |  |  |  |  |  |  |  |
Principal repayment schedule, end date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 31, 2019 |  |  |  |  |  |  |  |
Facility agreement, total principle payment in 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,500,000 |  |  |  |  |  |  |  |
Exchange price per share | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 1.22 |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |
Cash repayment |  |  |  |  |  |  |  |  |  |  |  | $ 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Deferred payment of credit facility principal amount |  |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Financing Obligation | Deerfield |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of notes to common shares, value |  |  |  |  |  |  | $ 3,200,000 |  | $ 5,592,750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion Option, shares | shares |  |  |  |  |  |  |  |  | 1,720,846 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange price per share | $ / shares |  |  |  |  |  |  | $ 2.49 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred payment of credit facility principal amount |  |  |  |  |  |  | $ 1,300,000 | $ 4,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  |  |  |  | 3 |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of shares | $ / shares |  |  |  | $ 2.01 |  |  | $ 2.75 |  | $ 3.25 | $ 3.25 |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.75 |
Common stock, shares issued | shares |  |  |  |  |  |  | 1,267,972 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Milestone rights liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,200,000 | 7,200,000 |  |  |  |  |  |  |
Remaining milestone rights liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,900,000 | $ 8,900,000 |  |  |  |  |  |  |
Facility Financing Obligation | Deerfield | Scenario Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Required payment for milestone liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |
Facility Financing Obligation | Deerfield | Accrued Expenses and Other Current Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Milestone rights liability, current |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,600,000 |  |  |  |  |  |  |  |
Facility Financing Obligation | Deerfield | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion Option, shares | shares |  | 5,749,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold in underwritten public offering | shares |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Financing Obligation | Deerfield | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion Option, shares | shares |  |  |  | 9,558,382 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Financing Obligation | Deerfield | Maximum | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold in underwritten public offering | shares |  |  |  |  |  |  |  |  |  | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Debt instrument date of last required payment. + References No definition available. + Details
Name: | mnkd_DebtInstrumentDateOfLastRequiredPayment
Namespace Prefix: | mnkd_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Deferred payment of credit facility. + References No definition available. + Details
Name: | mnkd_DeferredPaymentOfCreditFacility
Namespace Prefix: | mnkd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line of credit facility restricted borrowing capacity for each quarter end after current fiscal year. + References No definition available. + Details
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