Financing Arrangements (Outstanding Debt Obligations) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019
Debt Instrument [Line Items]
Less: current maturities	$ (8,402)	$ (6,142)
Long-term debt, less current maturities	92,075	93,240
Line of Credit | NovaQuest Securities Purchase Agreement
Debt Instrument [Line Items]
Principal amount	60,000	60,000
Less: unamortized debt issuance costs	(523)	(756)
Loan payables less unamortized debt issuance costs	59,477	59,244
Less: current maturities	0	0
Long-term debt, less current maturities	59,477	59,244
Term Loan | Hercules Loan Agreement
Debt Instrument [Line Items]
Principal amount	40,000	40,000
End of term charge	2,620	2,620
Less: unamortized debt issuance costs	(1,620)	(2,482)
Loan payables less unamortized debt issuance costs	41,000	40,138
Less: current maturities	(8,402)	(6,142)
Long-term debt, less current maturities	$ 32,598	$ 33,996