Significant Customers and Geographic Information (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011
Revenue	$ 39,249	$ 42,913	$ 112,613	$ 121,468
North America [Member]
Revenue	25,213	28,840	73,100	79,847
Revenue in percentage	64.00%	67.00%	65.00%	66.00%
Europe and Middle East [Member]
Revenue	10,594	11,715	30,077	34,088
Revenue in percentage	27.00%	27.00%	27.00%	28.00%
Latin America [Member]
Revenue	2,948	1,111	8,232	4,273
Revenue in percentage	8.00%	3.00%	7.00%	3.00%
Asia Pacific and Other International Locations [Member]
Revenue	$ 494	$ 1,247	$ 1,204	$ 3,260
Revenue in percentage	1.00%	3.00%	1.00%	3.00%