Net Loss Per Share (Tables)
 3 Months Ended
Apr. 30, 2019
Earnings Per Share [Abstract]  
Calculation of Basic and Diluted Net Loss Per Share
The following table presents the calculation of basic and diluted net loss per share (in thousands, except per share data):
 
Three Months Ended
April 30,
 
2019
 
2018
Numerator:
 
 
 
Net loss
$
(12,064
)
 
$
(6,579
)
Denominator:
 
 
 
Weighted-average shares used in calculating net loss per share, basic and diluted
32,510

 
20,878

Net loss per share, basic and diluted
$
(0.37
)
 
$
(0.32
)
Schedule of Anti-dilutive Securities That Were Not Included in Diluted Per Share Calculations Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows (in thousands):
 
As of April 30,
 
2019
 
2018
Redeemable convertible preferred stock
—

 
36,001

Shares subject to outstanding common stock options
16,529

 
12,387

Unvested early exercised stock options
273

 
211

Warrants to purchase common stock
—

 
204

Early exercised stock options in exchange for note receivable
—

 
250

Restricted stock awards purchased with promissory notes
472

 
629

Total
17,274

 
49,682