Long-term Debt (Outstanding Debt Obligations) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Mar. 31, 2017
Debt Instrument [Line Items]
Loan payables less unamortized debt issuance costs	$ 28,575	$ 0
Line of Credit | NovaQuest Securities Purchase Agreement
Debt Instrument [Line Items]
Principal amount	6,000
Less: unamortized debt issuance costs	(950)
Loan payables less unamortized debt issuance costs	5,050
Less: current maturities	0
Long-term loan payable, net of current maturities and unamortized debt issuance costs	5,050
Term Loan | Hercules Loan Agreement
Debt Instrument [Line Items]
Principal amount	25,000
End of term charge	1,638
Less: unamortized debt issuance costs	(3,113)
Loan payables less unamortized debt issuance costs	23,525
Less: current maturities	0
Long-term loan payable, net of current maturities and unamortized debt issuance costs	$ 23,525