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Description of Business and Significant Accounting Policies - Additional Information (Detail)
 1 Months Ended 3 Months Ended 9 Months Ended
Apr. 10, 2020
USD ($)
Aug. 31, 2020
USD ($)
Principal
Jun. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Segment
Contract
Dec. 31, 2019
USD ($)
Aug. 31, 2019
USD ($)
Aug. 06, 2019
USD ($)
Jul. 01, 2013
USD ($)
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Accumulated deficit       $ (3,022,732,000) $ (2,991,903,000)      
Principal amount       122,600,000        
Cash and cash equivalents       $ 52,398,000 29,906,000      
Number of operating segment | Segment       1        
Proceeds from loans       $ 4,873,000        
Short-term investments       0 19,978,000      
Long-term Investments       0        
Remaining milestone rights liability       7,300,000 7,300,000      
Liabilities for uncertain income tax positions       $ 0        
Accounting Standards Update 2016-13                
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Change in accounting principle, accounting standards update, adopted [true false]       true        
Change in accounting principle, accounting standards update, adopted date       Jan. 01, 2020        
Change in accounting principle, accounting standards update, immaterial effect [true false]       true        
Commitment Asset | Other Expense                
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Asset impairment     $ 1,900,000          
Insulin                
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Loss on purchase commitments       $ 94,800,000 92,000,000.0      
Loss on purchase commitments, number of new contracts recognized | Contract       0        
Maximum | AFREZZA product sales                
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Sales return right following product expiration in months       12 months        
Minimum | AFREZZA product sales                
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Sales return right following product expiration in months       6 months        
Paycheck Protection Program Loan, CARES Act                
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Principal amount       $ 4,900,000        
Proceeds from loans $ 4,900,000              
Facility Financing Obligation | Deerfield                
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Remaining milestone rights liability       7,300,000 7,300,000      
MidCap Credit Facility                
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Principal amount       40,000,000.0 40,000,000.0      
Principal amount           $ 65,000,000.0 $ 75,000,000.0  
Amount outstanding       $ 40,000,000.0 40,000,000.0      
Amount available under credit facility           25,000,000.0    
Minimum cash covenant             15,000,000.0  
Line of credit facility covenant terms       In August 2020, the Company entered into an 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. After the November 30, 2020 reporting period, the amendment will expire and a breach of the minimum Afrezza net revenue covenant is probable. The Company intends to amend the MidCap Credit Facility to address this probable covenant violation; however, such amendment, if completed, would occur after the date of this report.        
Outstanding principal       $ 39,346,000 $ 38,851,000      
Number of principal payments payable | Principal   36            
Line of credit facility principal payment start date   Sep. 01, 2021            
Line of credit facility principal payment end date   Aug. 01, 2024            
Commitment asset           1,500,000    
Other asset           400,000    
MidCap Credit Facility | Commitment Asset                
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Asset impairment     $ 1,900,000          
MidCap Credit Facility | Current Debt                
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Outstanding principal       40,000,000.0        
MidCap Credit Facility | Tranche 2                
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Amount available under credit facility           10,000,000.0    
Minimum cash covenant       15,000,000.0        
MidCap Credit Facility | Tranche 3                
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Amount available under credit facility           $ 25,000,000.0    
Minimum cash covenant       20,000,000.0     $ 20,000,000.0  
MidCap Credit Facility | Tranche 1                
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Minimum cash covenant   $ 40,000,000.0            
Milestone Rights Liability | Deerfield                
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Contingent liability remain payable       $ 70,000,000.0        
Milestone Rights Liability | Maximum | Deerfield                
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Contingent liability for milestone payments               $ 90,000,000.0