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Financing Arrangements (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Dec. 31, 2018
Oct. 31, 2017
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2018
Debt Instrument [Line Items]              
Equity options, purchase price as a percentage of share price   105.00%          
Equity commitment, number of consecutive trading days used for measuring share price   5 days          
Equity option   $ 20,000,000.0          
Equity option to be exercised in the current year   $ 10,000,000.0          
Common Shares              
Debt Instrument [Line Items]              
Warrants exercisable as a percentage of principal amount of loan   3.00%          
Private Placement              
Debt Instrument [Line Items]              
Shares purchased by NovaQuest (in shares)   138,361          
Shares purchased by NovaQuest   $ 2,000,000.0          
Line of Credit | NovaQuest Securities Purchase Agreement              
Debt Instrument [Line Items]              
Maximum borrowing commitment   60,000,000.0          
Equity commitment related to note issuance   20,000,000.0          
Minimum borrowing commitment   30,000,000.0          
Debt issued $ 54,000,000.0 $ 6,000,000.0          
Interest rate   15.00%          
Quarterly interest rate   5.00%          
Deferred interest rate   10.00%          
Default interest rate   5.00%          
Financing expenses   $ 1,000,000.0          
Amortized deferred financing costs     $ 100,000 $ 100,000   $ 200,000  
Term Loan | Hercules Loan Agreement              
Debt Instrument [Line Items]              
Maximum borrowing commitment   $ 40,000,000.0          
Interest rate   8.25%          
Amortized deferred financing costs     $ 400,000 $ 300,000 $ 900,000 $ 700,000  
Principal amount funded   $ 25,000,000.0         $ 15,000,000.0
Current interest rate     9.00%   9.00%    
End of term charge   6.55%          
Term Loan | Hercules Loan Agreement | Prime Rate              
Debt Instrument [Line Items]              
Variable interest rate   4.00%          
Tranche 1 | Common Shares              
Debt Instrument [Line Items]              
Number of securities exercisable by warrant (in shares)   49,800          
Exercise price of warrants (in USD per share)   $ 15.06          
Fair value of warrant on date of issuance   $ 500,000          
Tranche 1 | Term Loan | Hercules Loan Agreement              
Debt Instrument [Line Items]              
Financing expenses   1,300,000          
Discount   $ 2,100,000          
Tranche 2 | Common Shares              
Debt Instrument [Line Items]              
Number of securities exercisable by warrant (in shares)             23,910
Exercise price of warrants (in USD per share)             $ 18.82
Fair value of warrant on date of issuance             $ 300,000
Tranche 2 | Term Loan | Hercules Loan Agreement              
Debt Instrument [Line Items]              
Discount             $ 1,300,000
NovaQuest | Private Placement, One              
Debt Instrument [Line Items]              
Shares purchased by NovaQuest (in shares) 1,082,977            
Shares purchased by NovaQuest $ 18,000,000.0            
NovaQuest | Private Placement, Two              
Debt Instrument [Line Items]              
Shares purchased by NovaQuest (in shares) 1,203,307            
Shares purchased by NovaQuest $ 20,000,000.0