Balance Sheet Components

9 Months Ended

Oct. 31, 2019

Balance Sheet Components Disclosure [Abstract]

Inventory

Inventory consists of the following (in thousands):


	As of January 31, 2019		As of October 31, 2019
Raw materials	$	3,349	$	3,163
Finished goods	41,338		36,688
Inventory	$	44,687	$	39,851

Property and Equipment, Net

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


	As of January 31, 2019		As of October 31, 2019
Test equipment	$	170,930	$	199,878
Computer equipment and software	117,330		139,188
Furniture and fixtures	6,980		8,483
Leasehold improvements	34,286		40,235
Total property and equipment	329,526		387,784
Less: accumulated depreciation and amortization	(204,173)		(257,548)
Property and equipment, net	$	125,353	$	130,236

Depreciation and amortization expense was $16.9 million and $20.6 million for the three months ended October 31, 2018 and 2019, and $49.8 million and $60.3 million for the nine months ended October 31, 2018 and 2019.

Intangible Assets, Net

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


	As of January 31, 2019										As of October 31, 2019
	Gross Carrying Value		Accumulated Amortization		Net Carrying Amount		Gross Carrying Value		Accumulated Amortization		Net Carrying Amount
Technology patents	$	10,125	$	(6,572)	$	3,553	$	19,125	$	(8,235)	$	10,890
Developed technology	17,700		(1,135)		16,565		56,100		(5,962)		50,138
Intangible assets, net	$	27,825	$	(7,707)	$	20,118	$	75,225	$	(14,197)	$	61,028

Intangible assets amortization expense was $0.9 million and $2.6 million for the three months ended October 31, 2018 and 2019, and $1.6 million and $6.5 million for the nine months ended October 31, 2018 and 2019. As of October 31, 2019, the weighted-average remaining amortization period was 4.0 years for technology patents and 6.2 years for developed technology. Amortization of the technology patents is included in general and administrative expenses due to their defensive nature and amortization of developed technology is included in cost of product revenue in the condensed consolidated statements of operations.

As of October 31, 2019, future expected amortization expense for intangible assets is as follows (in thousands):


Fiscal Years Ending January 31,	Estimated Future Amortization Expense
Remainder of 2020	$	2,771
2021	10,804
2022	9,846
2023	9,300
2024	9,300
Thereafter	19,007
Total	$	61,028

Goodwill

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


	Amount
Balance as of January 31, 2019	$	10,997
Goodwill acquired	25,423

Balance as of October 31, 2019	$	36,420

Accrued Expenses and Other Liabilities

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


	As of January 31, 2019		As of October 31, 2019
Taxes payable	$	7,146	$	10,579
Accrued marketing	6,173		10,159
Accrued travel and entertainment expenses	3,570		3,054
Acquisition consideration held back	3,725		—
Other accrued liabilities	19,246		24,431
Total accrued expenses and other liabilities	$	39,860	$	48,223