Quarterly report pursuant to Section 13 or 15(d)

Composition of Certain Financial Statement Captions (Details)

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Composition of Certain Financial Statement Captions (Details) (USD $)
In Thousands, unless otherwise specified
Oct. 31, 2012
Jan. 31, 2012
Oct. 31, 2011
Jan. 31, 2011
Cash, Cash Equivalents and Short-term Investments        
Total cash and cash equivalents $ 57,725 $ 44,126 $ 53,876 $ 43,048
Total short-term investments 22,778 46,455    
Cash, cash equivalents and short-term investments 80,503 90,581    
Cash
        
Cash, Cash Equivalents and Short-term Investments        
Total cash and cash equivalents 14,255 6,604    
Money market funds
        
Cash, Cash Equivalents and Short-term Investments        
Total cash and cash equivalents 32,820 31,614    
Commercial paper
        
Cash, Cash Equivalents and Short-term Investments        
Total cash and cash equivalents 10,000 2,893    
Total short-term investments 12,244 27,587    
Corporate debt securities
        
Cash, Cash Equivalents and Short-term Investments        
Total cash and cash equivalents 650 3,015    
Total short-term investments 10,534 17,968    
U.S. agency notes
        
Cash, Cash Equivalents and Short-term Investments        
Total short-term investments   $ 900