Financing Arrangements (Narrative) (Details) - USD ($)				1 Months Ended		3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 30, 2019	Dec. 27, 2019	Dec. 31, 2018	Oct. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 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
Payment of annual debt administration fee								$ 300,000	$ 300,000
Loss on extinguishment of debt			$ 4,900,000			$ 4,851,000	$ 0	4,851,000	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
Debt issued				$ 54,000,000.0	6,000,000.0
Equity commitment related to note issuance					$ 20,000,000.0
Interest rate					15.00%
Quarterly interest rate					5.00%
Deferred interest rate					10.00%
Default interest rate					5.00%
Amortized deferred financing costs						100,000		300,000
Payment of annual debt administration fee						300,000			300,000
Principal repayment of debt	$ 60,000,000.0
Accrued interest repayment of debt	7,600,000
Prepayment penalty	$ 2,400,000
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	$ 1,300,000	$ 1,000,000.0
Principal amount funded					$ 25,000,000.0					$ 15,000,000.0
Current interest rate	8.75%					8.75%		8.75%
End of term charge					6.55%
Principal repayment of debt	$ 40,000,000.0
Accrued interest repayment of debt	300,000
Prepayment penalty	400,000
End-of-term charge	$ 2,600,000
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
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
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
Majority Shareholder | DSP | Term Loan | Letter Agreement with Sumitomo Dainippon Pharma, Co., Ltd.
Debt Instrument [Line Items]
Maximum borrowing commitment			400,000,000.0
Debt issued		$ 113,700,000	$ 113,700,000
Default interest rate			5.00%