Long-term Debt (Outstanding Debt Obligations) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018
Debt Instrument [Line Items]
Loan payables less unamortized debt issuance costs	$ 44,560	$ 43,624
Line of Credit \| NovaQuest Securities Purchase Agreement
Debt Instrument [Line Items]
Principal amount	6,000	6,000
Less: unamortized debt issuance costs	(639)	(854)
Loan payables less unamortized debt issuance costs	5,361	5,146
Less: current maturities	0	0
Long-term loan payable, net of current maturities and unamortized debt issuance costs	5,361	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	(3,421)	(4,142)
Loan payables less unamortized debt issuance costs	39,199	38,478
Less: current maturities	0	0
Long-term loan payable, net of current maturities and unamortized debt issuance costs	$ 39,199	$ 38,478

Debt Instrument, End of Term Charge

No definition available.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Amount of unamortized debt discount (premium) and debt issuance costs.

+ References

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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