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Long-term Debt (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Oct. 31, 2017
Sep. 30, 2018
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      
Equity option to be exercised in the current year $ 10,000,000      
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      
Line of Credit | NovaQuest Securities Purchase Agreement        
Debt Instrument [Line Items]        
Maximum borrowing commitment 60,000,000      
Equity commitment related to note issuance 20,000,000      
Minimum borrowing commitment 30,000,000      
Debt issued $ 6,000,000      
Interest rate 15.00%      
Quarterly interest rate 5.00%      
Deferred interest rate 10.00%      
Default interest rate 5.00%      
Financing expenses $ 1,000,000      
Amortized deferred financing costs   $ 100,000 $ 200,000  
Term Loan | Hercules Loan Agreement        
Debt Instrument [Line Items]        
Maximum borrowing commitment $ 40,000,000      
Interest rate 8.25%      
Default interest rate 5.00%      
Amortized deferred financing costs   $ 300,000 $ 700,000  
Principal amount funded $ 25,000,000     $ 15,000,000
Current interest rate   9.25% 9.25%  
End of term charge 6.55%      
Term Loan | Hercules Loan Agreement | Prime Rate        
Debt Instrument [Line Items]        
Variable interest rate 4.00%      
Tranche One | 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 One | Term Loan | Hercules Loan Agreement        
Debt Instrument [Line Items]        
Financing expenses 1,300,000      
Discount 2,100,000      
Tranche Two | 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 Two | Term Loan | Hercules Loan Agreement        
Debt Instrument [Line Items]        
Discount       $ 1,300,000