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Borrowings - MidCap Credit Facility - Additional Information (Detail) | 1 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2021 USD ($) | Dec. 31, 2020 Installment | Aug. 31, 2019 USD ($) Installment | Jun. 30, 2022 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2021 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maturity date |  | Dec. 31, 2025 |  | Nov. 03, 2024 |  |  |
Unamortized debt discount |  |  |  |  | $ 954,000 |  |
MidCap Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Prepaid of borrowing |  | $ 10,000,000.0 |  |  |  |  |
Debt instrument payment term description |  |  |  |  | Principal on each term loan advance under Tranche 1 and Tranche 2 are payable in 24 equal monthly installments beginning September 1, 2023, until paid in full on August 1, 2025. |  |
Debt instrument minimum unrestricted cash and short-term investments |  |  |  | $ 90,000,000.0 |  |  |
Principal prepayment against outstanding term loans |  | 10,000,000.0 |  |  |  |  |
Original exit fee and prepayment penalties |  | 1,000,000.0 |  |  |  |  |
Unamortized debt discount |  |  |  |  | $ 300,000 |  |
Debt Instrument unamortized prepayment penalty. |  |  |  |  | $ 700,000 |  |
Interest on loans increased, percentage |  |  |  | 2.00% |  |  |
MidCap Credit Facility | On or After April 23, 2022 Through and Including April 22, 2023 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Early termination fees, percentage |  |  |  |  | 2.00% |  |
MidCap Credit Facility | On or Prior to April 22, 2022 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Early termination fees, percentage |  |  |  |  | 3.00% |  |
MidCap Credit Facility | On or After April 23, 2023 Through Maturity Date |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Early termination fees, percentage |  |  |  |  | 1.00% |  |
MidCap Credit Facility | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate floor | [1] |  |  |  | 1.00% |  |
Tranche 1 | MidCap Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Advance of borrowing |  |  |  | $ 40,000,000.0 |  |  |
Maturity date |  |  |  | Aug. 01, 2025 |  |  |
Annual interest rate |  |  |  | 8.25% |  |  |
Debt payable number of equal monthly installments | Installment |  |  |  | 24 |  |  |
Line of credit facility principal payment start date |  |  |  | Sep. 01, 2023 |  |  |
Tranche 1 | MidCap Credit Facility | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate (LIBOR) |  |  |  | 6.25% |  |  |
Interest rate floor |  |  |  | 1.00% |  |  |
Tranche 2 | MidCap Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Advance of borrowing |  |  |  |  |  | $ 10,000,000.0 |
Maturity date |  |  | Aug. 01, 2025 |  |  |  |
Annual interest rate |  |  | 8.25% |  |  | 8.25% |
Debt payable number of equal monthly installments | Installment |  |  | 24 |  |  |  |
Line of credit facility principal payment start date |  |  | Sep. 01, 2023 |  |  |  |
Tranche 2 | MidCap Credit Facility | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate (LIBOR) |  |  | 6.25% |  |  |  |
Interest rate floor |  |  | 1.00% |  |  |  |
Tranche 3 | MidCap Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amount available under credit facility |  | $ 60,000,000.0 |  |  | $ 60,000,000.0 |  | $ 25,000,000.0
Debt instrument advance available date |  | Jun. 30, 2022 |  |  |  |  |
Debt instrument extended interest-only date |  | Sep. 01, 2023 |  |  |  |  |
Maturity date |  | Aug. 01, 2025 |  |  |  |  |
Debt instrument payment term description |  |  |  |  | The MidCap credit facility has been amended several times, including in April 2021 when the parties agreed to, among other things, (i) increase the amount available under the third advance from $25.0 million to $60.0 million and extend the date through which the third advance is available to June 30, 2022, (ii) amend the conditions to the third advance of $60.0 million being available to draw, including certain milestone conditions associated with Tyvaso DPI, (iii) remove the Company’s obligation to issue a warrant to purchase shares of the Company’s common stock upon drawing down the third advance, (iv) extend the interest-only period until September 1, 2023 and extend the maturity date until August 1, 2025, (v) amend the financial covenant relating to trailing 12 month minimum Afrezza net revenue, (vi) decrease the minimum cash covenant, (vii) decrease the interest rate on any amounts outstanding, now or in the future, under the MidCap credit facility, (viii) permit the Company to make certain acquisitions, subject to requirements, and (ix) permit the Company to make investments of up to an additional $9.0 million so long as the Company has $90.0 million or more of unrestricted cash and short-term investments following such investment. |  |
Maximum value of additional investment limit |  | $ 9,000,000.0 |  |  |  |  |
Debt instrument minimum unrestricted cash and short-term investments |  | $ 90,000,000.0 |  |  |  |  |
[1] | In April 2021, the Company prepaid $10.0 million principal balance and amended the MidCap credit facility. The interest rate prior to the amendment was one-month LIBOR (2% floor) plus 6.75% and the maturity date was in August 2024.

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