Balance Sheet Components (Tables)

12 Months Ended

Jan. 31, 2017

Balance Sheet Components Disclosure [Abstract]

Schedule of Property and Equipment, Net

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

	January 31,
	2016			2017
Test equipment	$	65,663		$	105,955
Computer equipment and software	31,388			54,521
Furniture and fixtures	2,852			4,494
Leasehold improvements	4,935			10,332
Total property and equipment	104,838			175,302
Less: accumulated depreciation and amortization	(52,209		)	(93,607		)
Property and equipment, net	$	52,629		$	81,695

Schedule of Intangible Assets, Net

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

	January 31,
	2016			2017
Technology patents	$	9,125		$	10,125
Accumulated amortization	(2,145		)	(3,565		)
Intangible assets, net	$	6,980		$	6,560

Schedule of Expected Amortization Expenses for Intangible Assets

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

Year Ending January 31,	Estimated Future Amortization Expense
2018	$	1,504
2019	1,504
2020	1,504
2021	1,504
2022	544
Total	$	6,560

Schedule of Accrued Expenses and Other Liabilities

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

	January 31,
	2016		2017
Sales and use tax payable	$	299	$	540
Accrued professional fees	3,044		1,765
Accrued marketing	2,684		6,718
Accrued travel and entertainment expenses	2,182		2,235
Income tax payable	1,791		1,135
Other accrued liabilities	4,076		9,304
Total accrued expenses and other liabilities	$	14,076	$	21,697