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Borrowings - MidCap Credit Facility - Additional Information (Detail)
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2021
USD ($)
Installment
Dec. 31, 2020
Installment
Aug. 31, 2019
USD ($)
Installment
Mar. 31, 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       $ 1,061,000    
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, 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.    
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    
Minimum cash covenant     $ 10,000,000.0      
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, most recently in April 2021, 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          
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 3 | MidCap Credit Facility | LIBOR            
Debt Instrument [Line Items]            
Interest rate (LIBOR) 6.25%          
Interest rate floor 1.00%          
[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.