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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2015
Oct. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (55,117) $ (45,421) $ (152,575) $ (121,494)
Other comprehensive loss*:        
Changes in foreign currency translation adjustment [1] 13 (16) (15) (21)
Net change in unrealized gains on available-for-sale investments 4 0 (3) 0
Other comprehensive loss 17 (16) (18) (21)
Comprehensive loss $ (55,100) $ (45,437) $ (152,593) $ (121,515)
[1] Tax effect was not material