Net Loss per Share Attributable to Common Stockholders (Tables)
 3 Months Ended
Apr. 30, 2019
Earnings Per Share [Abstract]  
Calculation of basic and diluted loss per share

The following table presents the calculation of basic and diluted net loss per share attributable to common stockholders for periods presented:
 
Three Months Ended April 30,
(in thousands, except per share data)
2019
 
2018
Numerator:
 
 
 
Net loss
$
(45,722
)
 
$
(270,687
)
Less: preferred stock accretion
—

 
(353
)
Net loss attributable to common stockholders
$
(45,722
)
 
$
(271,040
)
Denominator:
 
 
 
Weighted-average common shares outstanding
172,101

 
36,334

Net loss per share attributable to common stockholders:
 
 
 
Basic and diluted
$
(0.27
)
 
$
(7.46
)
Antidilutive securities
Outstanding potentially dilutive securities that were excluded from the diluted per share calculations because they would have been antidilutive are as follows:
 
April 30,
(in thousands)
2019
 
2018
Convertible preferred stock as-converted
—

 
100,350

Stock options
10,989

 
18,477

Warrants to purchase convertible preferred stock
—

 
22

RSUs
14,620

 
15,002

ESPP
288

 
—

Total antidilutive securities
25,897

 
133,851