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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Jan. 31, 2016
Activity of Allowance for Doubtful Accounts

The activity of the allowance for doubtful accounts for the years ended January 31, 2016, 2015 and 2014 was as follows:

 

     Balance at
beginning  of
year		      Additions      Deductions     Balance at
end of
year		  

Year ended January 31, 2016

    $ 850         6,578         (6,764 )    $ 664   

Year ended January 31, 2015

    $ 1,711         4,666         (5,527 )    $ 850   

Year ended January 31, 2014

    $ 1,681         4,400         (4,370 )    $ 1,711   
Activity of Sales Return Reserve

The activity of the sales returns reserve for the years ended January 31, 2016, 2015 and 2014 was as follows:

 

     Balance at
beginning of
year		      Additions      Deductions     Balance at
end of
year		  

Year ended January 31, 2016

    $ 19,804         96,707         (92,126 )    $ 24,385   

Year ended January 31, 2015

    $ 17,089         80,390         (77,675 )    $ 19,804   

Year ended January 31, 2014

    $ 14,448         64,313         (61,672 )    $ 17,089