Long-term Debt (Outstanding Debt Obligations) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Debt Instrument [Line Items]
Principal amount	$ 46,000
Loan payables less unamortized debt issuance costs	43,624	$ 0
Line of Credit | NovaQuest Securities Purchase Agreement
Debt Instrument [Line Items]
Principal amount	6,000
Less: unamortized debt issuance costs	(854)
Loan payables less unamortized debt issuance costs	5,146
Less: current maturities	0
Long-term loan payable, net of current maturities and unamortized debt issuance costs	5,146
Term Loan | Hercules Loan Agreement
Debt Instrument [Line Items]
Principal amount	40,000
End of term charge	2,620
Less: unamortized debt issuance costs	(4,142)
Loan payables less unamortized debt issuance costs	38,478
Less: current maturities	0
Long-term loan payable, net of current maturities and unamortized debt issuance costs	$ 38,478