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Borrowings - MidCap Credit Facility - Additional Information (Detail) |  |  | 1 Months Ended | 12 Months Ended |  |  |
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Apr. 22, 2021 USD ($) Installment | Aug. 06, 2019 | Apr. 30, 2021 USD ($) | Dec. 31, 2020 Installment $ / shares shares | Nov. 30, 2020 USD ($) Installment | Dec. 31, 2019 | Aug. 31, 2019 USD ($) Installment $ / shares shares | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) $ / shares shares | Oct. 31, 2021 shares | Mar. 31, 2021 USD ($) | Aug. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt, net |  |  |  |  |  |  |  |  | $ 17,200,000 | $ 264,000 |  |  |
Maturity date |  | Dec. 31, 2025 |  |  |  |  |  | Nov. 03, 2024 |  |  |  |  |
Debt instrument payment term description |  |  |  |  |  |  |  |  | Principal on each term loan advance under Tranche 1, Tranche 2 and, if applicable, Tranche 3 is payable in 24 equal monthly installments beginning September 1, 2023, until paid in full on August 1, 2025. |  |  |  |
Unamortized debt discount |  |  |  |  |  |  |  |  | $ 1,167,000 |  |  |  |
On or After April 23, 2022 Through and Including April 22, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Early Termination Fees Percentage |  |  |  |  |  |  |  |  | 2.00% |  |  |  |
On or Prior to April 22, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Early Termination Fees Percentage |  |  |  |  |  |  |  |  | 3.00% |  |  |  |
On or After April 23, 2023 Through Maturity Date |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Early Termination Fees Percentage |  |  |  |  |  |  |  |  | 1.00% |  |  |  |
MidCap Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid of borrowing |  |  |  | $ 10,000,000.0 |  |  |  |  | $ 10,000,000.0 |  |  |  |
Minimum cash covenant |  |  |  |  |  | $ 30,000,000.0 |  | $ 90,000,000.0 |  |  |  |  |
Debt payable number of equal monthly installments | Installment |  |  |  |  |  | 24,000,000 |  |  |  |  |  |  |
Debt instrument minimum unrestricted cash and short-term investments |  |  |  |  |  |  |  | $ 10,000,000.0 |  |  |  |  |
Principal prepayment against outstanding term loans |  | $ 10,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Original exit fee and prepayment penalties |  | $ 1,000,000.0 |  |  |  |  |  |  | 1,000,000.0 |  |  |  |
Unamortized debt discount |  |  |  |  |  |  |  |  | 400,000 |  |  |  |
Debt Instrument unamortized prepayment penalty. |  |  |  |  |  |  |  |  | $ 800,000 |  |  |  |
Interest on loans increased, percentage |  |  | 2.00% |  |  |  |  |  |  |  |  |  |
Term loan advance percentage of amount drawdown |  |  |  |  |  |  |  | 3.25% |  |  |  |  |
MidCap Credit Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Annual interest rate | [1] |  |  |  |  |  |  |  | 1.00% |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt payable number of equal monthly installments | Installment |  |  |  |  |  |  |  | 24 |  |  |  |  |
Maturity date |  |  |  |  |  |  |  | Aug. 01, 2025 |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  | 8.25% |  |  |  |  |
Line Of Credit Facility Principal Payment Start Date |  |  |  |  |  |  |  | Sep. 01, 2023 |  |  |  |  |
Tranche 1 | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  | 6.25% |  |  |  |  |
Annual interest rate |  |  |  |  |  |  |  | 1.00% |  |  |  |  |
Tranche 1 | MidCap Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Advance of borrowing |  |  |  |  |  |  |  | $ 40,000,000.0 |  |  |  |  |
Minimum cash covenant |  |  |  |  |  |  |  |  |  |  |  |  | $ 40,000,000.0
Loss on extinguishment of debt, net |  |  |  |  |  |  |  |  |  | $ 200,000 |  |  |
Warrants to purchase of common stock | shares |  |  |  |  |  |  |  | 1,171,614 |  |  | 1,171,614 |  |
Exercise price of warrants | $ / shares |  |  |  |  |  |  |  | $ 1.11 |  |  |  |  |
Tranche 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt payable number of equal monthly installments | Installment |  |  |  |  | 24 |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | Aug. 01, 2025 |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  | 8.25% |  |  |  |  | 8.25% |  |  |
Line Of Credit Facility Principal Payment Start Date |  |  |  |  | Sep. 01, 2023 |  |  |  |  |  |  |  |
Tranche 2 | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 6.25% |  |  |  |  |  |  |  |
Annual interest rate |  |  |  |  | 1.00% |  |  |  |  |  |  |  |
Tranche 2 | MidCap Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Advance of borrowing |  |  |  |  |  |  |  |  |  | $ 10,000,000.0 |  |  |
Amount available under credit facility |  |  |  |  |  |  |  | $ 10,000,000.0 |  |  |  |  |
Debt discount and a de minimis amount of debt issuance costs |  |  |  |  |  |  |  |  |  | $ 300,000 |  |  |
Warrants to purchase of common stock | shares |  |  |  |  | 111,853 |  |  |  |  | 111,853 | 111,853 |  |
Exercise price of warrants | $ / shares |  |  |  |  | $ 2.91 |  |  |  |  | $ 2.91 |  |  |
Tranche 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt payable number of equal monthly installments | Installment |  | 24 |  |  |  |  |  |  |  |  |  |  |
Maturity date |  | Aug. 01, 2025 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 8.25% |  |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility Principal Payment Start Date |  | Sep. 01, 2023 |  |  |  |  |  |  |  |  |  |  |
Tranche 3 | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 6.25% |  |  |  |  |  |  |  |  |  |  |
Annual interest rate |  | 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 |  | On April 22, 2021, the Company entered into the seventh amendment of the MidCap credit facility, pursuant to which 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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