Stock-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Apr. 30, 2013	Jan. 31, 2013
Summary of option activity
Options Available for Grant, Beginning balance	4,112,156
Number of Options Outstanding, Beginning balance	7,799,011
Weighted Average Exercise Price, Beginning balance	$ 3.02
Option Available for Grant, Granted	(3,055,000)
Number of Options Outstanding, Granted	3,055,000
Weighted Average Exercise Price, Granted	$ 2.50
Number of Options Outstanding, Exercised	(13,167)
Weighted Average Exercise Price, Exercised	$ 1.25
Option Available for Grant, Cancelled	1,585,191
Number of Options Outstanding, Cancelled	(1,585,191)
Weighted Average Exercise Price, Cancelled	$ 3.11
Restricted stock units granted, net of cancellations(2), Options Available for Grant	(2,187,100)
Options Available for Grant, Ending balance	455,247	4,112,156
Number of Options Outstanding, Ending balance	9,140,137	7,799,011
Weighted Average Exercise Price, Ending balance	$ 2.85	$ 3.02
Number of options outstanding, Vested and expected to vest	8,701,743
Weighted average exercise price, Vested and expected to vest	$ 2.85
Number of options outstanding, Vested and exercisable	3,176,656
Weighted average exercise price, Vested and exercisable	$ 2.69
Weighted Average Grant Date Fair Value, Granted	$ 0.84
Weighted Average Remaining Contractual Life, Beginning balance	7 years 1 month 17 days	5 years 9 months
Vested and expected-to-vest, Weighted average remaining contractual term	7 years 26 days
Vested and exercisable, Weighted average remaining contractual term	5 years 26 days
Weighted Average Remaining Contractual Life, Ending balance	7 years 1 month 17 days	5 years 9 months
Aggregate intrinsic value, Beginning balance	$ 1,091
Aggregate intrinsic value, Exercised	16
Vested and expected-to-vest, Aggregate intrinsic value	930
Vested and exercisable, Aggregate intrinsic value	930
Aggregate intrinsic value, Ending balance balance	$ 930	$ 1,091
Roll Over Options [Member]
Summary of option activity
Number of Options Outstanding, Expired	(115,516)