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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Jan. 31, 2014
Accounting Policies [Abstract]  
Customers Accounted for Greater Than Ten Percent of Total Revenues or Ten Percent of Accounts Receivable

The following table provides information concerning customers that individually accounted for greater than 10% of total revenues or 10% of accounts receivable, and their respective percentages of total revenues and accounts receivable, as of January 31, 2014, 2013 and 2012:

 

     Year Ended January 31,  
     2014     2013     2012  
     Percentage of
total revenues		     Percentage of
accounts
receivable at
fiscal year end		     Percentage of
total revenues		     Percentage of
accounts
receivable at
fiscal year end		     Percentage of
total revenues		     Percentage of
accounts
receivable at
fiscal year end		  

Customer A

      12 %      21 %      11 %      24 %      13 %        * 

Customer B

        *        *        *      15 %        *      19 % 

Customer C

        *      15 %        *        *        *        * 

Customer D

        *      14 %        *        *        *      15 % 

Customer E

        *      10 %        *      11 %        *      13 % 

* less than 10%
Estimated Useful Life of Assets

Depreciation is computed using the straight-line method over the estimated useful life of each asset, generally is as follows:

 

Asset classification

   

Estimated Useful Life
Computer equipment    3-5 years
Software    3 years
Office equipment and furniture    3-5 years
Leasehold improvements   

Shorter of useful life or remaining

life of lease