Balance Sheet Components - (Tables)

6 Months Ended

Jul. 31, 2019

Balance Sheet Components Disclosure [Abstract]

Inventory

Inventory consists of the following (in thousands):

	As of January 31, 2019		As of July 31, 2019
Raw materials	$	3,349	$	2,623
Finished goods	41,338		33,197
Inventory	$	44,687	$	35,820

Property and Equipment, Net

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

	As of January 31, 2019			As of July 31, 2019
Test equipment	$	170,930		$	191,846
Computer equipment and software	117,330			135,178
Furniture and fixtures	6,980			7,732
Leasehold improvements	34,286			37,866
Total property and equipment	329,526			372,622
Less: accumulated depreciation and amortization	(204,173		)	(241,574		)
Property and equipment, net	$	125,353		$	131,048

Intangible Assets, Net

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

	As of January 31, 2019							As of July 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	$	(7,538	)	$	11,587
Developed technology	17,700		(1,135		)	16,565		56,100		(4,028		)	52,072
Intangible assets, net	$	27,825	$	(7,707	)	$	20,118	$	75,225	$	(11,566	)	$	63,659

Expected Amortization Expenses for Intangible Assets

As of July 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	$	5,402
2021	10,804
2022	9,846
2023	9,300
2024	9,300
Thereafter	19,007
Total	$	63,659

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 July 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 July 31, 2019
Taxes payable	$	7,146	$	4,967
Accrued marketing	6,173		11,005
Accrued travel and entertainment expenses	3,570		3,055
Acquisition consideration held back	3,725		3,725
Other accrued liabilities	19,246		21,938
Total accrued expenses and other liabilities	$	39,860	$	44,690