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Description of Business and Significant Accounting Policies - Additional Information (Detail)
1 Months Ended 3 Months Ended
Aug. 06, 2019
USD ($)
Aug. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Segment
Contract
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jul. 01, 2013
USD ($)
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]            
Accumulated deficit     $ (3,001,225,000) $ (2,991,903,000)    
Principal amount     120,300,000      
Cash and cash equivalents     $ 38,868,000 29,906,000    
Number of operating segment | Segment     1      
Short-term investments     $ 0 19,978,000    
Asset impairment     1,521,000      
Remaining milestone rights liability     7,300,000 7,300,000    
Liabilities for uncertain income tax positions     0      
Commitment Asset | Other Expense            
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]            
Asset impairment     1,500,000      
Insulin            
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]            
Loss on purchase commitments     $ 90,200,000   $ 92,000,000  
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      
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 40,000,000    
Principal amount $ 75,000,000 $ 75,000,000        
Amount outstanding       $ 40,000,000    
Amount available under credit facility   35,000,000        
Minimum cash covenant 15,000,000          
Commitment asset   1,500,000        
MidCap Credit Facility | Commitment Asset            
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]            
Asset impairment     1,500,000      
MidCap Credit Facility | Tranche 2            
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]            
Amount available under credit facility   10,000,000        
Debt instrument, minimum target net revenue 30,000,000 30,000,000        
Minimum cash covenant     15,000,000      
MidCap Credit Facility | Tranche 3            
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]            
Amount available under credit facility   $ 25,000,000        
Minimum cash covenant $ 20,000,000   20,000,000      
Milestone Rights Liability | Deerfield            
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]            
Contingent liability remain payable     $ 70,000,000      
Milestone Rights Liability | Maximum | Deerfield            
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]            
Contingent liability for milestone payments           $ 90,000,000