Stock-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Summary of option activity
Option Available for Grant, Granted	(2,341,000)	(827,500)	(1,680,000)
Number of Options Outstanding, Granted	2,341,000	827,500	1,680,000
Weighted Average Exercise Price, Granted	$ 3.55	$ 3.56	$ 3.12
Option Available for Grant, Exercised	0	0	0
Number of Options Outstanding, Exercised	(127,373)	(3,882)	(62,337)
Weighted Average Exercise Price, Exercised	$ 1.25	$ 1.25	$ 1.25
Option Available for Grant, Expired	0	0	0
Number of Options Outstanding, Expired	(155,531)
Weighted Average Exercise Price, Expired	$ 1.25	$ 0.00	$ 0.00
Option Available for Grant, Cancelled	2,607,854	3,210,631	764,642
Number of Options Outstanding, Cancelled	(2,607,854)	(3,210,631)	(764,642)
Weighted Average Exercise Price, Cancelled	$ 3.10	$ 3.02	$ 3.38
Restricted stock units granted, net of cancellations(2), Options Available for Grant	(125,000)	705,000	(200,000)
Restricted stock units granted, net of cancellations(2), Weighted Average Exercise Price	$ 0.00	$ 0.00	$ 0.00
Options Available for Grant, Ending balance	4,112,156	3,970,302	882,171	1,997,529
Number of Options Outstanding, Ending balance	7,799,011	8,582,511	11,046,652	10,212,401
Weighted Average Exercise Price, Ending balance	$ 3.02	$ 2.79	$ 2.79	$ 2.76
Number of options outstanding, Vested and expected to vest	7,694,053
Weighted average exercise price, Vested and expected to vest	$ 3.01
Number of options outstanding, Vested and exercisable	4,435,976
Weighted average exercise price, Vested and exercisable	$ 2.72
Weighted Average Grant Date Fair Value, Granted	$ 1.01	$ 0.70	$ 0.64
Weighted Average Remaining Contractual Life, Beginning balance	5 years 9 months	6 years 11 months 16 days	7 years 2 months 16 days	8 years 7 months 24 days
Vested and expected-to-vest, Weighted average remaining contractual term	5 years 8 months 19 days
Vested and exercisable, Weighted average remaining contractual term	3 years 9 months 29 days
Weighted Average Remaining Contractual Life, Ending balance	5 years 9 months	6 years 11 months 16 days	7 years 2 months 16 days	8 years 7 months 24 days
Aggregate intrinsic value, Beginning balance	$ 8,009	$ 8,772	$ 3,524
Aggregate intrinsic value, Exercised	311	9	114
Vested and expected-to-vest, Aggregate intrinsic value	1,091
Vested and exercisable, Aggregate intrinsic value	1,091
Aggregate intrinsic value, Ending balance balance	$ 1,091	$ 8,009	$ 8,772	$ 3,524
Roll Over Options [Member]
Summary of option activity
Option Available for Grant, Cancelled	0	0	0
Number of Options Outstanding, Cancelled	(233,742)	(77,128)	(18,770)
Weighted Average Exercise Price, Cancelled	$ 1.25	$ 1.25	$ 1.25