Sales and Major Customers (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Summary of Company's revenues from customers by geographic region, outside the U.S.
Total revenues from customers	$ 81,317	$ 86,676	$ 59,704
Canada [Member]
Summary of Company's revenues from customers by geographic region, outside the U.S.
Total revenues from customers	13,744	13,243	5,294
UK and Europe [Member]
Summary of Company's revenues from customers by geographic region, outside the U.S.
Total revenues from customers	27,174	21,403	16,765
Latin America [Member]
Summary of Company's revenues from customers by geographic region, outside the U.S.
Total revenues from customers	15,575	17,786	8,042
Asia/South Pacific [Member]
Summary of Company's revenues from customers by geographic region, outside the U.S.
Total revenues from customers	14,173	17,810	15,444
Eurasia [Member]
Summary of Company's revenues from customers by geographic region, outside the U.S.
Total revenues from customers	4,052	3,528	10,812
Other [Member]
Summary of Company's revenues from customers by geographic region, outside the U.S.
Total revenues from customers	$ 6,599	$ 12,906	$ 3,347