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Borrowings - Deerfield Facility Financing Obligation - Additional Information (Detail) - USD ($)
9 Months Ended 12 Months Ended 24 Months Ended
Jul. 18, 2019
Sep. 30, 2019
Dec. 31, 2014
Dec. 31, 2014
Jun. 30, 2019
Dec. 31, 2018
Jul. 01, 2013
Debt Instrument [Line Items]              
Principal amount   $ 120,100,000          
Common stock, shares issued   206,407,551       187,029,967  
2019 notes              
Debt Instrument [Line Items]              
Unamortized debt issuance costs and debt discount   $ 0       $ 200,000  
Deerfield | 2019 notes              
Debt Instrument [Line Items]              
Principal amount             $ 160,000,000
Senior notes, effective interest rate   9.75%          
Conversion of notes to common shares, value $ 1,600,000            
Debt instrument, remaining borrowing capacity   $ 60,000,000          
Repayments of aggregate principal amount $ 2,400,000            
Common stock, shares issued 1,514,423            
Deerfield | Facility Financing Obligation              
Debt Instrument [Line Items]              
Conversion of notes to common shares, value       $ 100,000,000      
Repayments of aggregate principal amount   $ 5,000,000          
Deerfield | Tranche B notes              
Debt Instrument [Line Items]              
Senior notes, effective interest rate   8.75%          
Debt instrument additional borrowing capacity     $ 20,000,000        
Debt instrument, remaining borrowing capacity   $ 20,000,000          
Deerfield | Facility Financing Obligation              
Debt Instrument [Line Items]              
Principal amount         $ 9,000,000    
Debt instrument, remaining borrowing capacity   $ 80,000,000