Balance Sheet Components

12 Months Ended

Jan. 31, 2021

Balance Sheet Components Disclosure [Abstract]

Inventory

Inventory consists of the following (in thousands):


	At the End of Fiscal
	2020		2021
Raw materials	$	2,974	$	4,991
Finished goods	35,544		41,742
Inventory	$	38,518	$	46,733

Property and Equipment, Net

Property and equipment, net consists of the following (in thousands):


	At the End of Fiscal
	2020		2021
Test equipment	$	205,555	$	238,069
Computer equipment and software	141,387		184,518
Furniture and fixtures	8,324		8,484
Leasehold improvements	40,356		44,444
Total property and equipment	395,622		475,515
Less: accumulated depreciation and amortization	(272,882)		(312,474)
Property and equipment, net	$	122,740	$	163,041

Depreciation and amortization expense related to property and equipment was $68.3 million, $80.4 million and $57.1 million for fiscal 2019, 2020 and 2021, respectively.

Intangible Assets, Net

Intangible assets, net consist of the following (in thousands):


	At the End of Fiscal
	2020						2021
	Gross Carrying Value		Accumulated Amortization		Net Carrying Amount		Gross Carrying Value		Accumulated Amortization		Net Carrying Amount
Technology patents	$	19,125	$	(8,933)	$	10,192	$	19,125	$	(11,722)	$	7,403
Developed technology	56,100		(8,035)		48,065		77,373		(17,499)		59,874
Customer relationships	—		—		—		6,459		(308)		6,151
Trade name	—		—		—		3,623		(403)		3,220
Intangible assets, net	$	75,225	$	(16,968)	$	58,257	$	106,580	$	(29,932)	$	76,648

Intangible assets amortization expense was $2.6 million, $9.3 million and $13.0 million for fiscal 2019, 2020 and 2021, respectively. At the end of fiscal 2021, the weighted-average remaining amortization period was 2.7 years for technology patents, 4.9 years for developed technology, 6.7 years for customer relationships, and 2.7 years for trade name. We recorded amortization of technology patents in general and administrative expenses due to their defensive nature, developed technology in cost of product revenue, and customer relationships and trade name in sales and marketing expenses in the consolidated statements of operations.

At the end of fiscal 2021, future expected amortization expense for intangible assets is as follows (in thousands):


Fiscal Years Ending	Future Expected Amortization Expense
2022	$	16,231
2023	15,685
2024	15,282
2025	14,477
2026	11,924
Thereafter	3,049
Total	$	76,648

Goodwill

The change in the carrying amount of goodwill is as follows (in thousands):


	Amount
Balance as of the end of fiscal 2020	$	37,584
Goodwill acquired	321,152
Balance as of the end of fiscal 2021	$	358,736

Accrued Expenses and Other Liabilities

Accrued expenses and other liabilities consist of the following (in thousands):


	At the End of Fiscal
	2020		2021
Taxes payable	$	9,012	$	4,097
Accrued marketing	7,679		15,638
Accrued travel and entertainment expenses	3,829		866

Acquisition consideration	6,149		9,600

Other accrued liabilities	20,554		31,553
Total accrued expenses and other liabilities	$	47,223	$	61,754