Stock-Based Compensation (Details 3) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Summary of Restricted Stock and Restricted Stock Units activity
Vested, Shares	(995,000)
Vested, Weighted Average Grant Date Fair Value	$ 3.00
Vested and expected-to-vest, Shares	429,978
Vested and expected-to-vest, Weighted average remaining contractual term	5 years 8 months 19 days
Vested and expected-to-vest, Aggregate intrinsic value	$ 1,091
Restricted Stock Units (RSUs) [Member]
Summary of Restricted Stock and Restricted Stock Units activity
Beginning balance, Shares	1,315,000	2,020,000	1,820,000
Beginning balance, Weighted Average Grant Date Fair Value	$ 3.04	$ 3.01	$ 3.00
Weighted Average Remaining Contractual Life, Beginning balance	1 year 8 months 16 days	10 months 17 days	1 year 9 months 4 days
Aggregate Intrinsic value, Beginning balance	4,892	7,232
Restricted stock units granted	310,000	45,000	300,000
Granted, Weighted Average Grant Date Fair Value	$ 3.56	$ 3.54	$ 3.10
Vested, Weighted Average Grant Date Fair Value		$ 0.00	$ 0.00
Cancelled, Shares	(185,000)	(750,000)	(100,000)
Cancelled, Weighted Average Grant Date Fair Value	$ 3.20	$ 3.01	$ 3.00
Ending balance, Shares	445,000	1,315,000	2,020,000
Ending balance, Weighted Average Grant Date Fair Value	$ 3.42	$ 3.04	$ 3.01
Weighted Average Remaining Contractual Life, Ending balance	1 year 8 months 16 days	10 months 17 days	1 year 9 months 4 days
Aggregate Intrinsic value, Ending balance	1,113	4,892	7,232
Vested and expected-to-vest, Weighted average remaining contractual term	1 year 8 months 9 days
Vested and expected-to-vest, Aggregate intrinsic value	$ 1,075