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Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Apr. 10, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Distributor
Dec. 31, 2019
USD ($)
Distributor
Aug. 31, 2019
USD ($)
Jul. 01, 2013
USD ($)
Summary Of Significant Accounting Policies [Line Items]            
Proceeds from Paycheck Protection Program Loan     $ 4,873,000      
Short-term investments     $ 0 $ 19,978,000    
Number of wholesale distributors | Distributor     3 3    
Percentage of sales from major wholesale distributors     86.00% 96.00%    
Percentage of accounts receivable from major wholesale distributors     90.00% 94.00%    
Asset impairments     $ 1,889,000 $ 0    
ASU 2016-13            
Summary Of Significant Accounting Policies [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            
Summary Of Significant Accounting Policies [Line Items]            
Asset impairments   $ 1,900,000        
MidCap Credit Facility            
Summary Of Significant Accounting Policies [Line Items]            
Commitment asset         $ 1,500,000  
Other asset         $ 400,000  
Milestone Rights Liability | Deerfield            
Summary Of Significant Accounting Policies [Line Items]            
Contingent liability remain payable     $ 70,000,000.0      
Paycheck Protection Program Loan CARES Act            
Summary Of Significant Accounting Policies [Line Items]            
Proceeds from Paycheck Protection Program Loan $ 4,900          
Insulin            
Summary Of Significant Accounting Policies [Line Items]            
Loss on purchase commitments     $ 95,300,000 $ 92,000,000.0    
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           $ 90,000,000.0
Maximum | AFREZZA product sales            
Summary Of Significant Accounting Policies [Line Items]            
Sales return right following product expiration in months     12 months