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Fair Value Measurements - Schedule of Liabilities Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Ending balance	$ 2,999us-gaap_DerivativeLiabilitiesCurrent	$ 2,601us-gaap_DerivativeLiabilitiesCurrent
Warrants
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning balance	2,601	3,633
Warrant issuance with equity offering	4,255
Warrant issuance with senior secured term loan	106	315
Mark to market adjustment	(3,963)	(1,347)
Ending balance	2,999	2,601
Derivative Liability
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Beginning balance		529
Mark to market adjustment		(525)
Extinguishment of derivative liability		$ (4)

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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