Consolidated Statements of Comprehensive Loss (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011
Statement of Other Comprehensive Income [Abstract]
Net income (loss)	$ 2,908	$ (3,299)	$ 5,128	$ (5,967)
Other comprehensive income (loss)	0	0	0	0
Comprehensive income (loss)	$ 2,908	$ (3,299)	$ 5,128	$ (5,967)