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Borrowings - MidCap Credit Facility - Additional Information (Detail) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 06, 2019 USD ($) Installment $ / shares shares | Nov. 30, 2020 USD ($) Installment $ / shares shares | Dec. 31, 2019 USD ($) | Aug. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
(Loss) gain on extinguishment of debt |  |  |  |  | $ (264) | $ 3,529
Unamortized debt discount |  |  |  |  | 665 |
Early termination fees, percentage | 2.00% |  |  |  |  |
MidCap Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount |  |  |  | $ 75,000 |  |
Advance of borrowing |  |  | $ 25,000 |  |  |
Amount available under credit facility |  |  |  | 25,000 | $ 25,000 |
Minimum cash covenant | $ 30,000 | $ 30,000 |  |  |  |
Debt instrument payment term description |  |  |  |  | In August 2020, the Company entered into the second amendment to the MidCap Credit Facility, pursuant to which the parties agreed that no breach of the minimum Afrezza net revenue covenant for any trailing twelve-month reporting period between July 31, 2020 and November 30, 2020 will be deemed to occur if the Company delivers satisfactory evidence that it had unrestricted cash of at least $40.0 million. Without this amendment, the Company would have been in violation of the minimum Afrezza net revenue covenant as of September 30, 2020. |
Debt payable number of equal monthly installments | Installment |  | 24,000,000 |  |  |  |
Credit facility, origination fee | $ 400 |  |  |  |  |
Interest on loans increased, percentage | 2.00% |  |  |  |  |
Term loan advance percentage of amount drawdown | 3.25% |  |  |  |  |
Warrants to purchase of common stock | shares | 1,171,614 | 111,853 |  |  |  |
Exercise price of warrants | $ / shares | $ 1.11 | $ 2.91 |  |  |  |
MidCap Credit Facility | Between First Anniversary and Prior to Second Anniversary of Closing Date |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Early termination fees, percentage | 4.00% |  |  |  |  |
MidCap Credit Facility | Prior to First Anniversary of Closing Date |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Early termination fees, percentage | 2.00% |  |  |  |  |
MidCap Credit Facility | After Second Anniversary and Prior to Third Anniversary of Closing Date |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Early termination fees, percentage | 3.00% |  |  |  |  |
MidCap Credit Facility | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate floor |  |  |  |  | 6.75% |
MidCap Credit Facility | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument Exit Fee Percentage |  |  | 6.00% |  |  |
MidCap Credit Facility | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument Exit Fee Percentage |  |  | 7.00% |  |  |
Tranche 1 | MidCap Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Advance of borrowing |  |  |  | 40,000 |  |
Minimum cash covenant |  |  |  | 40,000 |  |
(Loss) gain on extinguishment of debt |  |  |  |  | $ 200 |
Unamortized debt discount |  |  |  |  | 400 |
Warrants to purchase of common stock | shares | 1,171,614 |  |  |  |  |
Exercise price of warrants | $ / shares | $ 1.11 |  |  |  |  |
Tranche 1 | MidCap Credit Facility | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate (LIBOR) | 6.75% |  |  |  |  |
Interest rate floor | 2.00% |  |  |  |  |
Tranche 2 | MidCap Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amount available under credit facility |  |  |  | 10,000 |  |
Minimum cash covenant |  |  |  |  | 30,000 |
Debt discount and a de minimis amount of debt issuance costs |  |  |  |  | 300 |
Unamortized debt discount |  |  |  |  | $ 300 |
Warrants to purchase of common stock | shares | 111,853 |  |  |  |  |
Exercise price of warrants | $ / shares | $ 2.91 |  |  |  |  |
Tranche 2 | MidCap Credit Facility | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate (LIBOR) | 6.75% |  |  |  |  |
Interest rate floor | 2.00% |  |  |  |  |
Tranche 3 | MidCap Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amount available under credit facility |  | $ 25,000 |  | $ 25,000 |  |
Minimum cash covenant |  | $ 25,000 |  |  |  |
Debt instrument payment term description |  |  |  |  | principal on the term loan advance under Tranche 3 is payable beginning on the later of (i) September 1, 2022, and (ii) the first day of the first full calendar month immediately following such term loan advance, in an amount equal to the outstanding term loan advance in respect of Tranche 3 divided by the number of full calendar months remaining before August 1, 2024. |
Tranche 3 | MidCap Credit Facility | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate (LIBOR) | 6.75% |  |  |  |  |
Interest rate floor | 2.00% |  |  |  |  |
Tranche 1 and Tranche 2 | MidCap Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument payment term description |  |  |  |  | principal on the term loan advance under Tranche 3 is payable beginning on the later of (i) September 1, 2022, and (ii) the first day of the first full calendar month immediately following such term loan advance, in an amount equal to the outstanding term loan advance in respect of Tranche 3 divided by the number of full calendar months remaining before August 1, 2024. |
Debt payable number of equal monthly installments | Installment | 24 |  |  |  |  |

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