Balance Sheet Components (Tables)

12 Months Ended

Jan. 31, 2018

Balance Sheet Components Disclosure [Abstract]

Schedule of Inventory, Current

Inventory consists of the following (in thousands):

	January 31,
	2017		2018
Raw materials	$	3,003	$	1,181
Finished goods	20,495		33,316
Inventory	$	23,498	$	34,497

Schedule of Property and Equipment, Net

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

	January 31,
	2017			2018
Test equipment	$	105,955		$	142,311
Computer equipment and software	54,521			72,329
Furniture and fixtures	4,494			5,363
Leasehold improvements	10,332			15,032
Total property and equipment	175,302			235,035
Less: accumulated depreciation and amortization	(93,607		)	(145,893		)
Property and equipment, net	$	81,695		$	89,142

Schedule of Intangible Assets, Net

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

	January 31,
	2017			2018
Technology patents	$	10,125		$	10,125
Accumulated amortization	(3,565		)	(5,068		)
Intangible assets, net	$	6,560		$	5,057

Schedule of Expected Amortization Expenses for Intangible Assets

As of January 31, 2018, expected future amortization expense for intangible assets is as follows (in thousands):

Year Ending January 31,	Estimated Future Amortization Expense
2019	$	1,504
2020	1,504
2021	1,504
2022	545
Total	$	5,057

Schedule of Accrued Expenses and Other Liabilities

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

	January 31,
	2017		2018
Taxes payable	$	1,675	$	4,052
Accrued marketing	6,718		5,928
Accrued travel and entertainment expenses	2,235		4,386
Other accrued liabilities	11,069		12,463
Total accrued expenses and other liabilities	$	21,697	$	26,829