Balance Sheet Components (Tables)

6 Months Ended

Jul. 31, 2017

Balance Sheet Components Disclosure [Abstract]

Schedule of Inventory

Inventory consists of the following (in thousands):

	As of January 31, 2017		As of July 31, 2017
Raw materials	$	3,003	$	2,966
Finished goods	20,495		30,694
Inventory	$	23,498	$	33,660

Schedule of Property and Equipment, Net

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

	As of January 31, 2017			As of July 31, 2017
Test equipment	$	105,955		$	125,348
Computer equipment and software	54,521			60,838
Furniture and fixtures	4,494			5,045
Leasehold improvements	10,332			13,092
Total property and equipment	175,302			204,323
Less: accumulated depreciation and amortization	(93,607		)	(122,473		)
Property and equipment, net	$	81,695		$	81,850

Schedule of Intangible Assets, Net

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

	As of January 31, 2017			As of July 31, 2017
Technology patents	$	10,125		$	10,125
Accumulated amortization	(3,565		)	(4,317		)
Intangible assets, net	$	6,560		$	5,808

Schedule of Expected Amortization Expenses for Intangible Assets

As of July 31, 2017, expected amortization expense for intangible assets for each of the next five years is as follows (in thousands):

Years Ending January 31,	Estimated  Future Amortization Expense
Remainder of 2018	$	752
2019	1,504
2020	1,504
2021	1,504
2022	544
Total	$	5,808

Schedule of Accrued Expenses and Other Liabilities

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

	As of January 31, 2017		As of July 31, 2017
Sales and use tax payable	$	540	$	298
Accrued professional fees	1,765		1,325
Accrued marketing	6,718		6,164
Accrued travel and entertainment expenses	2,235		4,014
Income tax payable	1,135		1,317
Other accrued liabilities	9,304		5,191
Total accrued expenses and other liabilities	$	21,697	$	18,309