Balance Sheet Components (Tables)

6 Months Ended

Jul. 31, 2018

Balance Sheet Components Disclosure [Abstract]

Schedule of Inventory

Inventory consists of the following (in thousands):

	As of January 31, 2018		As of July 31, 2018
Raw materials	$	1,181	$	2,828
Finished goods	33,316		38,845
Inventory	$	34,497	$	41,673

Schedule of Property and Equipment, Net

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

	As of January 31, 2018			As of July 31, 2018
Test equipment	$	142,311		$	156,040
Computer equipment and software	72,329			92,863
Furniture and fixtures	5,363			5,482
Leasehold improvements	15,032			23,763
Total property and equipment	235,035			278,148
Less: accumulated depreciation and amortization	(145,893		)	(176,430		)
Property and equipment, net	$	89,142		$	101,718

Schedule of Intangible Assets, Net

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

	As of January 31, 2018			As of July 31, 2018
Technology patents	$	10,125		$	10,125
Accumulated amortization	(5,068		)	(5,820		)
Intangible assets, net	$	5,057		$	4,305

Schedule of Expected Amortization Expenses for Intangible Assets

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

Fiscal Years Ending January 31,	Estimated  Future Amortization Expense
Remainder of 2019	$	752
2020	1,504
2021	1,504
2022	545
Total	$	4,305

Schedule of Accrued Expenses and Other Liabilities

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

	As of January 31, 2018		As of July 31, 2018
Taxes payable	$	4,052	$	3,801
Accrued marketing	5,928		5,017
Accrued travel and entertainment expenses	4,386		2,556
Other accrued liabilities	12,463		15,675
Total accrued expenses and other liabilities	$	26,829	$	27,049