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Net Loss per Share Attributable to Common Stockholders (Tables)
 6 Months Ended
Jul. 31, 2019
Earnings Per Share [Abstract]  
Schedule of 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 July 31,
 
Six Months Ended July 31,
(in thousands, except per share data)
2019
 
2018
 
2019
 
2018
Numerator:
 
 
 
 
 
 
 
Net loss
$
(68,632
)
 
$
(36,714
)
 
$
(114,354
)
 
$
(307,401
)
Less: preferred stock accretion
—

 
—

 
—

 
(353
)
Net loss attributable to common stockholders
$
(68,632
)
 
$
(36,714
)
 
$
(114,354
)
 
$
(307,754
)
Denominator:
 
 
 
 
 
 
 
Weighted-average common shares outstanding
175,389

 
166,084

 
173,773

 
102,284

Net loss per share attributable to common stockholders:
 
 
 
 
 
 
 
Basic and diluted
$
(0.39
)
 
$
(0.22
)
 
$
(0.66
)
 
$
(3.01
)
Schedule of antidilutive securities
Outstanding potentially dilutive securities that were excluded from the diluted per share calculations because they would have been antidilutive are as follows:
 
July 31,
(in thousands)
2019
 
2018
Stock options
9,752

 
18,122

RSUs
15,893

 
18,908

ESPP
288

 
—

Total antidilutive securities
25,933

 
37,030