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Debt - Narrative (Details) - Line of Credit - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 12, 2019
Jun. 17, 2019
Dec. 15, 2017
Oct. 31, 2017
Aug. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2017
Jun. 16, 2019
Dec. 31, 2019
Sep. 30, 2017
Aug. 31, 2017
Aug. 24, 2017
Madryn Credit Agreement                          
Debt Instrument [Line Items]                          
Maximum borrowing capacity   $ 25,000,000                     $ 65,000,000
Borrowings on credit facility         $ 10,000,000     $ 10,000,000          
Principal balance outstanding           $ 48,529,000   40,000,000   $ 48,142,000      
Principal           $ 65,000,000       $ 65,000,000      
Effective interest rate           18.40%              
Weighted average interest rate           10.60%              
Interest expense           $ 1,700,000 $ 1,400,000            
Fair value of options                       $ 15,100,000  
Debt discount         1,600,000     $ 5,000,000          
Legal expenses         $ 300,000           $ 1,300,000    
Madryn Credit Agreement | London Interbank Offered Rate (LIBOR)                          
Debt Instrument [Line Items]                          
Credit agreement interest rate   8.00%             11.00%        
Default interest rate           4.00%              
Madryn Credit Agreement - Term A                          
Debt Instrument [Line Items]                          
Maximum borrowing capacity                         $ 30,000,000.0
Madryn Credit Agreement - Term B-1                          
Debt Instrument [Line Items]                          
Borrowings on credit facility       $ 5,000,000                  
Madryn Credit Agreement - Term B-2                          
Debt Instrument [Line Items]                          
Borrowings on credit facility     $ 5,000,000                    
Madryn Credit Agreement - Term B-3 And B-4                          
Debt Instrument [Line Items]                          
Borrowings on credit facility $ 25,000,000                        
Madryn Credit Agreement - Term B-3                          
Debt Instrument [Line Items]                          
Additional borrowing capacity   $ 10,000,000                      
Madryn Credit Agreement - Term B-4                          
Debt Instrument [Line Items]                          
Additional borrowing capacity   $ 15,000,000