Balance Sheet Components (Tables)

6 Months Ended

Jul. 31, 2016

Balance Sheet Components Disclosure [Abstract]

Schedule of Property and Equipment, Net

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

	As of January 31, 2016			As of July 31, 2016
Test equipment	$	65,663		$	94,914
Computer, equipment and software	31,388			45,340
Furniture and fixtures	2,852			4,028
Leasehold improvements	4,935			7,839
Total property and equipment	104,838			152,121
Less: accumulated depreciation and amortization	(52,209		)	(73,598		)
Property and equipment, net	$	52,629		$	78,523

Schedule of Intangible Assets, Net

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

	As of January 31, 2016			As of July 31, 2016
Technology patents	$	9,125		$	10,125
Accumulated amortization	(2,145		)	(2,813		)
Intangible assets, net	$	6,980		$	7,312

Schedule of Expected Amortization Expenses for Intangible Assets

As of July 31, 2016, expected amortization expense for intangible assets for each of the next five years and thereafter is as follows (in thousands):

Fiscal Years Ending January 31,	Estimated  Future Amortization Expense
Remainder of 2017	$	752
2018	1,504
2019	1,504
2020	1,504
2021	1,504
Thereafter	544
Total	$	7,312

Schedule of Accrued Expenses and Other Liabilities

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

	As of January 31, 2016		As of July 31, 2016
Sales and use tax payable	$	299	$	150
Accrued professional fees	3,044		3,214
Accrued marketing	2,684		6,237
Accrued travel and entertainment expenses	2,182		3,223
Income tax payable	1,791		1,285
Other accrued liabilities	4,076		6,355
Total accrued expenses and other liabilities	$	14,076	$	20,464