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Subsequent Events - Additional Information (Detail) - Amendment to Athyrium Credit Agreement [Member] - USD ($)
1 Months Ended
Nov. 30, 2020
Sep. 30, 2020
Subsequent Event [Member]    
Subsequent Event [Line Items]    
Debt instrument, deferred quarterly required repayments $ 3,030,000  
Debt instrument principal repayment deferrment period 1 year  
Debt instrument, date of first required payment Mar. 31, 2022  
Amendment fee paid $ 260,000  
Principal and exit fee, prepaid without penalty $ 9,090,000  
Equity [Member]    
Subsequent Event [Line Items]    
Warrant, exercise price per share   $ 6.84
Equity [Member] | Subsequent Event [Member]    
Subsequent Event [Line Items]    
Warrant, exercise price per share $ 1.73  
Fiscal Quarter Ending September 30, 2020 through December 31, 2021 [Member] | Subsequent Event [Member]    
Subsequent Event [Line Items]    
Maximum permitted leverage ratio 5.60%  
After Fiscal Quarter Ending December 31, 2021 [Member] | Subsequent Event [Member]    
Subsequent Event [Line Items]    
Maximum permitted leverage ratio 5.00%  
Fiscal Quarters Ending September 30, 2020 through March 31, 2021 [Member] | Subsequent Event [Member]    
Subsequent Event [Line Items]    
Debt instrument covenant minimum liquidity $ 10,000,000  
After Fiscal Quarter Ending March 31, 2021 [Member] | Subsequent Event [Member]    
Subsequent Event [Line Items]    
Debt instrument covenant minimum liquidity $ 12,000,000