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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Jan. 31, 2018
Summary Of Significant Accounting Policies [Abstract]  
Activity of Allowance for Doubtful Accounts

The activity of the allowance for doubtful accounts for the years ended January 31, 2018, 2017 and 2016 was as follows:

 

 

 

Balance at

beginning of

year

 

 

Additions

 

 

Deductions

 

 

Balance at

end of

year

 

Year ended January 31, 2018

 

$

588

 

 

 

4,435

 

 

 

(3,697

)

 

$

1,326

 

Year ended January 31, 2017

 

$

664

 

 

 

4,892

 

 

 

(4,968

)

 

$

588

 

Year ended January 31, 2016

 

$

850

 

 

 

6,578

 

 

 

(6,764

)

 

$

664

 

 
Activity of Sales Return Reserve

The activity of the sales returns reserve for the years ended January 31, 2018, 2017 and 2016 was as follows:

 

 

 

Balance at

beginning of

year

 

 

Additions

 

 

Deductions

 

 

Balance at

end of

year

 

Year ended January 31, 2018

 

$

24,882

 

 

 

115,353

 

 

 

(111,333

)

 

$

28,902

 

Year ended January 31, 2017

 

$

24,385

 

 

 

105,909

 

 

 

(105,412

)

 

$

24,882

 

Year ended January 31, 2016

 

$

19,804

 

 

 

96,707

 

 

 

(92,126

)

 

$

24,385