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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Jan. 31, 2017
Accounting Policies [Abstract]  
Schedule of Changes in Allowance for Doubtful Accounts
The following table presents the changes in the allowance for doubtful accounts:
 
 
Year Ended January 31,
 
2015
 
2016
 
2017
 
(in thousands) 
Allowance for doubtful accounts, beginning balance
$
160

 
$
210

 
$
944

Provision
50

 
918

 
1,394

Writeoffs
—

 
(184
)
 
(338
)
Allowance for doubtful accounts, ending balance
$
210

 
$
944

 
$
2,000