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Description of Business - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Aug. 06, 2019
Aug. 31, 2019
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]          
Accumulated deficit     $ (2,991,903,000)   $ (2,940,000,000)
Principal amount     120,300,000    
Cash and cash equivalents     29,906,000   71,157,000
Short-term investments     19,978,000    
Remaining debt amount     70,020,000   72,089,000
The Mann Group LLC          
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]          
Remaining debt amount       $ 70,100,000 72,100,000
Facility Financing Obligation | Deerfield          
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]          
Repayments of aggregate principal amount     5,000,000    
Convertible Promissory Note | The Mann Group LLC          
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]          
Principal amount     35,000,000   $ 71,500,000
Repayments of debt     $ 11,000,000    
Conversion price of shares     $ 2.50   $ 4.00
Senior notes, effective interest rate     7.00%   5.84%
Convertible Promissory Note | The Mann Group LLC | New Loan Arrangement          
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]          
Principal amount     $ 35,000,000    
Conversion price of shares   $ 2.50 $ 2.50    
Senior notes, effective interest rate   7.00%      
Non-Convertible Promissory Note | The Mann Group LLC          
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]          
Principal amount     $ 35,100,000    
Senior notes, effective interest rate     7.00%    
Non-Convertible Promissory Note | The Mann Group LLC | New Loan Arrangement          
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]          
Principal amount     $ 35,100,000    
Senior notes, effective interest rate   7.00%      
2021 Notes          
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]          
Principal amount     10,200,000    
Repayments of aggregate principal amount     $ 8,500,000    
Reducing senior subordinated interest rate, percentage     5.75%    
June 2020 Note          
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]          
Principal amount     $ 2,600,000    
Maturity period, month and year     2020-06    
December 2020 Note          
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]          
Principal amount     $ 2,600,000    
Maturity period, month and year     2020-12    
2024 Convertible Notes          
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]          
Principal amount     $ 5,000,000    
Conversion price of shares     $ 3.00    
Maturity period, month and year     2024-11    
Senior notes, effective interest rate     5.75%    
MidCap Credit Facility          
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]          
Principal amount     $ 40,000,000    
Principal amount, credit facility   $ 75,000,000      
Amount outstanding     40,000,000    
Amount available under credit facility   35,000,000      
Reducing senior subordinated interest rate, percentage 2.00%        
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      
Minimum cash covenant $ 15,000,000   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