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Goodwill and Acquired Intangible Assets, Net
 12 Months Ended
Jan. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Acquired Intangible Assets, Net Goodwill and Acquired Intangible Assets, Net
The following table summarizes the changes in the carrying amount of goodwill during the periods presented (in thousands):
 
January 31, 2020
 
January 31, 2019
Balance, beginning of the year
$
41,878

 
$
1,700

Increase in goodwill related to business combinations
13,952

 
40,178

Balance, end of the year
$
55,830

 
$
41,878


Refer to Note 5, Business Combinations, for further details on the addition to goodwill.
The gross carrying amount and accumulated amortization of the Company’s intangible assets are as follows (in thousands):
 
January 31, 2020
 
Gross Carrying Value
 
Accumulated Amortization
 
Net Book Value
Developed technology
$
34,700

 
$
(11,495
)
 
$
23,205

Domain name
155

 
(151
)
 
4

Customer relationships
15,200

 
(3,630
)
 
11,570

Total
$
50,055

 
$
(15,276
)
 
$
34,779

 
 
January 31, 2019
 
Gross Carrying Value
 
Accumulated Amortization
 
Net Book Value
Developed technology
$
7,400

 
$
(4,358
)
 
$
3,042

Domain name
155

 
(128
)
 
27

Customer relationships
13,500

 
(675
)
 
12,825

Total
$
21,055

 
$
(5,161
)
 
$
15,894


Acquired intangible assets are amortized on a straight-line basis. As of January 31, 2020, the weighted-average remaining useful lives of identifiable, acquisition-related intangible assets was 4.3 years for developed technology, 0.2 years for domain name and 3.8 years for customer relationships. Amortization expense of intangible assets was $10.1 million, $2.3 million and $0.9 million for the years ended January 31, 2020, 2019 and 2018, respectively. Amortization expense for developed technology and the domain name was included as research and development expense in the Company’s consolidated statements of operations. Amortization expense for customer relationships was included as sales and marketing expense in the Company’s consolidated statements of operations.
As of January 31, 2020, future amortization expense related to the intangible assets is as follows (in thousands):
Years Ending January 31,
 
2021
$
8,504

2022
8,500

2023
8,500

2024
7,825

2025
1,450

Total
$
34,779