Stockholder's Equity (Details 3) (Stock options, USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Stock options
Number of shares
Outstanding at the beginning of the period (in shares)	3,409,433
Granted (in shares)	3,203,000
Exercised (in shares)	(22,542)
Forfeited (in shares)	(1,305,036)
Expired (in shares)	(654,033)
Outstanding at the end of the period (in shares)	4,630,822	3,409,433
Vested and expected to vest at the end of the period (in shares)	4,019,928
Exercisable at the end of the period (in shares)	2,083,884
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 2.41
Granted (in dollars per share)	$ 0.78
Exercised (in dollars per share)	$ 0.70
Forfeited (in dollars per share)	$ 1.27
Expired (in dollars per share)	$ 2.40
Outstanding at the end of the period (in dollars per share)	$ 1.61	$ 2.41
Vested and expected to vest at the end of the period (in dollars per share)	$ 1.75
Exercisable at the end of the period (in dollars per share)	$ 2.59
Weighted Average Remaining Contractual Term
Outstanding at the beginning of the period	7 years 7 months 6 days	7 years
Outstanding at the end of the period	7 years 7 months 6 days	7 years
Vested and expected to vest at the end of the period	7 years 3 months 18 days
Exercisable at the end of the period	5 years 3 months 18 days
Aggregate Intrinsic Value
Outstanding at the beginning of the period (in dollars)	$ 221,097
Outstanding at the end of the period (in dollars)	2,575	221,097
Vested and expected to vest at the end of the period	1,770
Stock-based compensation, additional disclosure
Aggregate intrinsic value of options exercised (in dollars)	$ 16,000	$ 220,000
Weighted average grant date fair value of awards granted (in dollars per share)	$ 0.52	$ 1.23