Balance Sheet Components (Tables)

12 Months Ended

Jan. 31, 2019

Balance Sheet Components Disclosure [Abstract]

Schedule of Inventory, Current

Inventory consists of the following (in thousands):

	January 31,
	2018		2019
Raw materials	$	1,181	$	3,349
Finished goods	33,316		41,338
Inventory	$	34,497	$	44,687

Schedule of Property and Equipment, Net

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

	January 31,
	2018			2019
Test equipment	$	142,311		$	170,930
Computer equipment and software	72,329			117,330
Furniture and fixtures	5,363			6,980
Leasehold improvements	15,032			34,286
Total property and equipment	235,035			329,526
Less: accumulated depreciation and amortization	(145,893		)	(204,173		)
Property and equipment, net	$	89,142		$	125,353

Schedule of Intangible Assets, Net

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

	As of January 31, 2018							As of January 31, 2019
	Gross Carrying Value		Accumulated Amortization			Net Carrying Amount		Gross Carrying Value		Accumulated Amortization			Net Carrying Amount
Technology patents	$	10,125	$	(5,068	)	$	5,057	$	10,125	$	(6,572	)	$	3,553
Developed technology	—		—			—		17,700		(1,135		)	16,565
Intangible assets, net	$	10,125	$	(5,068	)	$	5,057	$	27,825	$	(7,707	)	$	20,118

Schedule of Expected Amortization Expenses for Intangible Assets

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

Fiscal Years Ending January 31,	Estimated Future Amortization Expense
2020	$	4,032
2021	4,032
2022	3,074
2023	2,529
2024	2,529
Thereafter	3,922
Total	$	20,118

Goodwill

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

	Amount
Balance as of January 31, 2018	$	—
Goodwill acquired	10,997
Balance as of January 31, 2019	$	10,997

Schedule of Accrued Expenses and Other Liabilities

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

	January 31,
	2018		2019
Taxes payable	$	4,052	$	7,146
Accrued marketing	5,928		6,173
Accrued travel and entertainment expenses	4,386		3,570
Acquisition consideration held back	—		3,725
Other accrued liabilities	12,783		19,246
Total accrued expenses and other liabilities	$	27,149	$	39,860