(Outstanding Debt Obligations) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Debt Instrument [Line Items]
Principal amount	$ 100,000
Less: current maturities	(6,142)	$ 0
Long-term debt, net of current maturities and unamortized debt issuance costs	93,240	43,624
Line of Credit | NovaQuest Securities Purchase Agreement
Debt Instrument [Line Items]
Principal amount	60,000	6,000
Less: unamortized debt issuance costs	(756)	(854)
Loan payables less unamortized debt issuance costs	59,244	5,146
Less: current maturities	0	0
Long-term debt, net of current maturities and unamortized debt issuance costs	59,244	5,146
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	(2,482)	(4,142)
Loan payables less unamortized debt issuance costs	40,138	38,478
Less: current maturities	(6,142)	0
Long-term debt, net of current maturities and unamortized debt issuance costs	$ 33,996	$ 38,478