Balance Sheet Components (Tables)

12 Months Ended

Jan. 31, 2016

Balance Sheet Components Disclosure [Abstract]

Schedule of Property and Equipment, Net

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

	January 31,
	2015			2016
Test equipment	$	37,059		$	65,663
Computer equipment and software		19,022			31,388
Furniture and fixtures		2,460			2,852
Leasehold improvements		3,776			4,935
Total property and equipment		62,317			104,838
Less: accumulated depreciation and amortization		(22,458	)		(52,209	)
Property and equipment, net	$	39,859		$	52,629

Schedule of Intangible Assets, Net

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

	January 31,
	2015			2016
Technology patents	$	9,125		$	9,125
Accumulated amortization		(841	)		(2,145	)
Intangible assets, net	$	8,284		$	6,980

Schedule of Expected Amortization Expenses for Intangible Assets

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

Fiscal Year Ending January 31,	EstimatedFuture Amortization Expense
2017	$	1,304
2018		1,304
2019		1,304
2020		1,304
2021		1,304
Thereafter		460
Total	$	6,980

Schedule of Accrued Expenses and Other Liabilities

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

	January 31,
	2015		2016
Sales and use tax payable	$	591	$	299
Accrued professional fees		1,502		3,044
Accrued travel and entertainment expenses		1,138		2,182
Income tax payable		779		1,791
Other accrued liabilities		2,096		6,760
Total accrued expenses and other liabilities	$	6,106	$	14,076