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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2019
USD ($)
Distributor
Dec. 31, 2018
USD ($)
Distributor
Jan. 01, 2019
USD ($)
Jul. 01, 2013
USD ($)
Summary Of Significant Accounting Policies [Line Items]        
Number of wholesale distributors | Distributor 3 3    
Percentage of sales from major wholesale distributors 96.00% 89.00%    
Asset impairments $ 0 $ 0    
Liabilities for uncertain income tax positions 0 0    
(“ASC”) Topic 842 – Leases        
Summary Of Significant Accounting Policies [Line Items]        
Increase in total assets and total liabilities     $ 5,200,000  
Deerfield | Facility Financing Obligation        
Summary Of Significant Accounting Policies [Line Items]        
Remaining milestone rights liability 7,300,000 8,900,000    
Milestone Rights Liability | Deerfield        
Summary Of Significant Accounting Policies [Line Items]        
Contingent liability remain payable 70,000,000      
Cost of Goods Sold        
Summary Of Significant Accounting Policies [Line Items]        
Purchase commitments, amendment fees 2,800,000 2,000,000    
Insulin        
Summary Of Significant Accounting Policies [Line Items]        
Loss on purchase commitments $ 92,000,000 $ 98,300,000    
Minimum | AFREZZA product sales        
Summary Of Significant Accounting Policies [Line Items]        
Sales return right following product expiration in months 6 months      
Maximum | Milestone Rights Liability | Deerfield        
Summary Of Significant Accounting Policies [Line Items]        
Contingent liability for milestone payments       $ 90,000,000
Maximum | AFREZZA product sales        
Summary Of Significant Accounting Policies [Line Items]        
Sales return right following product expiration in months 12 months