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Warrants and Derivative Liabilities (Tables)

12 Months Ended

Mar. 31, 2015

Class Of Warrant Or Right [Line Items]

Schedule of Fair Value Assumptions Used to Calculate Value of Convertible Note Derivative Feature

Following is a summary of the key assumptions used to value the convertible notes derivative features:

	March 31,				December 31,				September 30,				June 30,
Fiscal Year 13	2014				2013				2013				2013
Principal outstanding (000's)	$                  —				$	10,411			$	10,411			$	14,389
Stock price	N/A				$	16.40			$	23.40			$	26.40
Percentage volume condition met	— %					87.20	%			80.20	%			87.50	%
Expected volatility	— %					68.63	%			66.26	%			65.80	%
Risk free rate	— %					0.12	%			0.10	%			0.21	%
Bond yield	— %					16.50	%			15.50	%			16.70	%
Recovery rate	— %					35.00	%			35.00	%			37.00	%
Redeemable	N/A				yes				yes				yes
Total time (years)	—					0.75				1.00				1.26
Dilution effect	N/A				yes				yes				yes
Fair value	$                  —				$                  —				$ 0.2 million				$ 0.5 million
Fair value as a percent of par	— %					0.02	%			0.70	%			3.30	%
									Post-modification				Pre-modification
	March 31,				December 31,				December 20,				December 20,				September 30,				June 30,				April 4,
Fiscal Year 12	2013				2012				2012				2012				2012				2012				2012
Principal outstanding (000's)	$	15,380			$	20,944			$	20,944			$	24,074			$	24,074			$	25,000			$	25,000
Stock price	$	26.70			$	26.20			$	29.50			$	29.50			$	41.50			$	46.80			$	39.70
Percentage volume condition met		80.50	%			94.50	%			94.90	%			28.60	%			51.00	%			75.20	%			85.90	%
Expected volatility		66.91	%			73.50	%			72.50	%			72.50	%			70.00	%			71.00	%			75.00	%
Risk free rate		0.20	%			0.23	%			0.25	%			0.25	%			0.23	%			0.33	%			0.44	%
Bond yield		16.50	%			16.50	%			16.50	%			16.50	%			15.00	%			16.00	%			15.00	%
Recovery rate		30.00	%			30.00	%			30.00	%			30.00	%			30.00	%			30.00	%			30.00	%
Redeemable	yes				yes				yes				yes				yes				yes				yes
Total time (years)		1.51				1.76				1.79				1.79				2.01				2.28				2.50
Dilution effect	yes				yes				yes				yes				yes				yes				yes
Fair value	$ 0.5 million				$ 1.0 million				$ 1.5 million				$ 0.9 million				$ 2.8 million				$ 4.5 million				$ 3.8 million
Fair value as a percent of par		3.40	%			4.90	%			7.10	%			3.90	%			11.40	%			17.90	%			15.10	%

Senior Secured Term Loan Second Warrant

Class Of Warrant Or Right [Line Items]

Schedule of Assumptions Used to Calculate the Fair Value of Warrants

Following is a summary of the key assumptions used to calculate the fair value of the Second Warrant:

					Pre-Exchange
	December 31,				December 19,				September 30,				June 30,
Fiscal Year 14	2014				2014				2014				2014
Risk-free interest rate		—	%			1.65	%			1.65	%			1.57	%
Expected annual dividend yield		—	%			—	%			—	%			—	%
Expected volatility		—	%			71.82	%			78.10	%			80.00	%
Term  (years)	—					4.41				4.62				4.87
Fair value	—				$0.1 million				$ 0.2 million				$ 0.3 million
									New Issuance
	March 31,				December 31,				November 15,
Fiscal Year 13	2014				2013				2013
Risk-free interest rate		1.76	%			1.89	%			1.55	%
Expected annual dividend yield		—	%			—	%			—	%
Expected volatility		79.73	%			80.37	%			76.97	%
Term  (years)		5.12				5.37				5.49
Fair value	$ 0.3 million				$ 0.3 million				$ 0.3 million

Senior Secured Term Loan New Warrant

Class Of Warrant Or Right [Line Items]

Schedule of Assumptions Used to Calculate the Fair Value of Warrants

Following is a summary of the key assumptions used to calculate the fair value of the Warrant:

									New Issuance
	March 31,				December 31,				December 19,
Fiscal Year 14	2015				2014				2014
Risk-free interest rate		1.41	%			1.73	%			1.74	%
Expected annual dividend yield		—	%			—	%			—	%
Expected volatility		74.60	%			77.43	%			70.26	%
Term  (years)		5.25				5.50				5.53
Fair value	$0.2 million				$0.2 million				$0.2 million

November 2014 Warrant

Class Of Warrant Or Right [Line Items]

Schedule of Assumptions Used to Calculate the Fair Value of Warrants

Following is a summary of the key assumptions used to calculate the fair value of the November 2014 Warrant:

									New Issuance
	March 31,				December 31,				November 13,
Fiscal Year 14	2015				2014				2014
Risk-free interest rate		1.28	%			1.61	%			1.64	%
Expected annual dividend yield		—	%			—	%			—	%
Expected volatility		75.96	%			78.00	%			72.86	%
Term  (years)		4.62				4.87				5.00
Fair value	$2.5 million				$3.2 million				$4.3 million

Loan and Security Agreement

Class Of Warrant Or Right [Line Items]

Schedule of Assumptions Used to Calculate the Fair Value of Warrants

Following is a summary of the key assumptions used to calculate the fair value of the First Warrant:

					Pre-Exchange
	December 31,				December 19,				September 30,				June 30,
Fiscal Year 14	2014				2014				2014				2014
Risk-free interest rate		—	%			1.10	%			1.13	%			1.04	%
Expected annual dividend yield		—	%			—	%			—	%			—	%
Expected volatility		—	%			67.01	%			78.30	%			82.75	%
Term  (years)	—					2.96				3.18				3.43
Fair value	—				$ 0.1 million				$ 0.1 million				$ 0.1 million
									Post-modification				Pre-modification
	March 31,				December 31,				November 15,				November 15,				September 30,				June 30,
Fiscal Year 13	2014				2013				2013				2013				2013				2013
Risk-free interest rate		1.18	%			1.24	%			1.00	%			1.00	%			1.09	%			1.20	%
Expected annual dividend yield		—	%			—	%			—	%			—	%			—	%			—	%
Expected volatility		80.73	%			74.79	%			72.64	%			72.64	%			72.10	%			72.30	%
Term  (years)		3.68				3.93				4.05				4.05				4.18				4.43
Fair value	$ 0.1 million				$ 0.1 million				$ 0.1 million				$ 0.1 million				$ 0.2 million				$ 0.2 million
	March 31,				December 31,				September 30,				June 30,				June 5,
Fiscal Year 12	2013				2012				2012				2012				2012
Risk-free interest rate		0.70	%			0.75	%			0.64	%			0.80	%			0.77	%
Expected annual dividend yield		—	%			—	%			—	%			—	%			—	%
Expected volatility		72.01	%			80.14	%			81.18	%			80.32	%			79.99	%
Term  (years)		4.68				4.93				5.18				5.44				5.50
Fair value	$ 0.2 million				$ 0.2 million				$ 0.4 million				$ 0.5 million				$ 0.4 million

Securities Purchase Agreement

Class Of Warrant Or Right [Line Items]

Schedule of Assumptions Used to Calculate the Fair Value of Warrants

Following is a summary of the key assumptions used to calculate the fair value of the warrant:

	March 31,				December 31,				September 30,				June 30,
Fiscal Year 14	2015				2014				2014				2014
Risk-free interest rate		0.73	%			1.00	%			1.07	%			0.98	%
Expected annual dividend yield		—	%			—	%			—	%			—	%
Expected volatility		70.42	%			72.38	%			76.20	%			83.50	%
Term  (years)	2.51				2.76				3.01				3.26
Fair value	$0.3 million				$0.5 million				$1.5 million				$2.3 million
									Post-modification				Pre-modification
	March 31,				December 31,				October 9,				October 9,				September 30,				June 30,
Fiscal Year 13	2014				2013				2013				2013				2013				2013
Risk-free interest rate		1.11	%			1.17	%			1.05	%			1.05	%			1.02	%			1.13	%
Expected annual dividend yield		—	%			—	%			—	%			—	%			—	%			—	%
Expected volatility		80.99	%			75.60	%			71.45	%			71.45	%			71.98	%			71.90	%
Term  (years)	3.51				3.76				3.99				3.99					4.01				4.27
Fair value	$ 2.2 million				$ 2.2 million				$ 3.2 million				$ 2.2 million				$ 2.5 million				$ 3.0 million
	March 31,				December 31,				September 30,				June 30,				April 4,
Fiscal Year 12	2013				2012				2012				2012				2012
Risk-free interest rate		0.67	%			0.75	%			0.63	%			0.77	%			1.19	%
Expected annual dividend yield		—	%			—	%			—	%			—	%			—	%
Expected volatility		71.74	%			80.60	%			80.90	%			80.80	%			80.00	%
Term  (years)		4.51				4.76				5.01				5.28				5.50
Fair value	$ 3.4 million				$ 4.4 million				$ 7.1 million				$ 8.6 million				$ 7.0 million

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Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.

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Tabular disclosure of the application of the fair value option for measurement and reporting of eligible financial assets and liabilities (as defined), as well as certain other eligible items (as defined) included in the statement of financial position, whether such option is elected for a single eligible item or a group of similar eligible items and is in addition to other disclosures concerning fair value which the company may be required to provide. Such disclosure might be expected to include: (1) for items included in the statement of financial position: (a) for each line item in the statement of financial position that includes an item or items for which the fair value option has been elected, provide the aggregate carrying amount of ineligible items included in each line item in the balance sheet, if any; (b) the difference between the aggregate fair value and the aggregate unpaid principal balance (assuming contractual principal amounts and fair value option elected) of: (i) loans and long-term receivables (other than securities otherwise reported at fair value) and (ii) long-term debt instruments; (c) for loans held as assets for which the fair value option has been elected: (i) the aggregate fair value of loans that are 90 days or more past due, (ii) if the policy is to recognize interest income separately from other changes in fair value, the aggregate fair value of loans in nonaccrual status, and (iii) the difference between the aggregate fair value and the aggregate unpaid principal balance for loans that are 90 days or more past due, in nonaccrual status, or both; (2) for items included in the income statement: (a) the amounts of gains and losses from fair value changes included in earnings and in which line in the income statement those gains and losses are reported whether or not combined with gains and losses from items required to be accounted for at fair value; (b) for loans and other receivables held as assets, the estimated amount of gains or losses included in earnings attributable to changes in instrument-specific credit risk; (c) for liabilities with fair values that have been significantly affected during the reporting period by changes in the instrument-specific credit risk, the estimated amount of gains and losses from fair value changes included in earnings that are attributable to changes in the instrument-specific credit risk; and (3) certain other disclosures as required or determined to be provided.

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