The cost and accumulated depreciation and amortization of property and equipment are as follows (in thousands):


	As of January 31,
	2020		2019

Computer equipment and software	$	22,489	$	18,259
Office furniture and equipment	12,672		11,907
Leasehold improvements	24,236		24,316

Property and equipment, gross	59,397		54,482
Less: accumulated depreciation and amortization	(37,409)		(26,863)
Property and equipment, net	$	21,988	$	27,619

Depreciation expense was $12.1 million, $8.3 million and $8.4 million for the years ended January 31, 2020, 2019 and 2018, respectively.

Intangible assets consisted of the following as of January 31, 2020 (in thousands):


	Gross Fair Value		Accumulated Amortization		Net Book Value		Weighted Average Remaining Useful Life (in years)
Developed technology	$	17,570	$	(11,321)	$	6,249	2.0
Customer relationships and other acquired intangible assets	671,447		(80,847)		590,600		8.9
Unbilled contracts	18,300		(9,913)		8,387		0.9
Total	$	707,317	$	(102,081)	$	605,236	8.7

Intangible assets consisted of the following as of January 31, 2019 (in thousands):


	Gross Fair Value		Accumulated Amortization		Net Book Value		Weighted Average Remaining Useful Life (in years)

Developed technology	$	11,986	$	(9,258)	$	2,728	1.9
Customer relationships and other acquired intangible assets	671,097		(12,036)		659,061		9.9
Unbilled contracts	18,300		(763)		17,537		1.9
Total	$	701,383	$	(22,057)	$	679,326	9.6

Amortization expense for intangible assets was $80.0 million, $9.1 million and $3.7 million during the years ended January 31, 2020, 2019 and 2018, respectively. The significant increase in fiscal 2020 relates to the amortization of intangible assets recognized as part of our merger with Hortonworks in January 2019.

The expected future amortization expense of these intangible assets as of January 31, 2020 is as follows (in thousands):


2021	$	77,941
2022	69,074
2023	66,722
2024	66,211
2025	66,160
2026 and thereafter	259,128
Total amortization expense	$	605,236

The following table represents the changes to goodwill (in thousands):




Balance at January 31, 2018	$	33,621
Hortonworks merger	552,835
Balance at January 31, 2019	586,456
Other ⁽¹⁾	3,905
Balance at January 31, 2020	$	590,361

(1) Other consists of certain purchase accounting adjustments related to our merger with Hortonworks and to a business combination.


	As of January 31,
	2020		2019
Accrued salaries, benefits and commissions	$	27,067	$	20,563
Accrued compensation-related taxes	15,205		11,797
Accrued bonuses	13,409		14,832
Employee stock purchase plan withholdings	2,732		1,902
Other	3,413		4,496
Total accrued compensation	$	61,826	$	53,590

Other accrued liabilities consist of the following (in thousands):


	As of January 31,
	2020		2019
Accrued professional costs	$	6,182	$	6,500

Accrued taxes	5,164		3,731
Accrued travel	1,574		2,751


Other ⁽¹⁾	9,377		11,566
Total other accrued liabilities	$	22,297	$	24,548

(1) Other includes amounts owed to third-party vendors that provide marketing, corporate event planning, cloud-computing services, self-insurance costs and amounts due for the settlement of certain marketable securities.