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Supplemental financial statement information (Tables)
 6 Months Ended
Jul. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Property and equipment
Property and equipment consisted of the following as of July 31, 2019 and January 31, 2019:
(in thousands)
 
July 31, 2019

 
January 31, 2019

Leasehold improvements
 
$
4,288

 
$
3,583

Furniture and fixtures
 
5,201

 
4,476

Computer equipment
 
11,279

 
9,242

Property and equipment, gross
 
20,768

 
17,301

Accumulated depreciation
 
(10,895
)
 
(9,078
)
Property and equipment, net
 
$
9,873

 
$
8,223
Investments
Investments consisted of the following equity investments as of July 31, 2019 and January 31, 2019:
(in thousands)
 
July 31, 2019

 
January 31, 2019

Marketable equity securities, at fair value
 
$
81,130

 
$
—

Non-marketable equity securities
 
500

 
500

Equity method investments
 
209

 
209

Total equity investments
 
$
81,839

 
$
709
Other income (expense), net
Other income (expense), net, consisted of the following:
 
 
Three months ended July 31,
 
 
Six months ended July 31,
 
(in thousands)
 
2019

 
2018

 
2019

 
2018

Interest income, net
 
$
1,817

 
$
234

 
$
3,097

 
$
425

Unrealized gain on marketable equity securities
 
3,774

 
—

 
27,285

 
—

Acquisition costs
 
(6,596
)
 
(224
)
 
(7,780
)
 
(225
)
Other
 
(123
)
 
(85
)
 
(130
)
 
(276
)
Total other income (expense), net
 
$
(1,128
)
 
$
(75
)
 
$
22,472

 
$
(76
)