Balance Sheet Components

Inventory

Inventory consists of the following (in thousands):



	As of January 31, 2017		As of April 30, 2017
Raw materials	$	3,003	$	10,865
Finished goods	20,495		28,613
Inventory	$	23,498	$	39,478

Property and Equipment, Net

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



	As of January 31, 2017			As of April 30, 2017
Test equipment	$	105,955		$	116,629
Computer equipment and software	54,521			57,453
Furniture and fixtures	4,494			4,691
Leasehold improvements	10,332			11,438
Total property and equipment	175,302			190,211
Less: accumulated depreciation and amortization	(93,607		)	(107,918		)
Property and equipment, net	$	81,695		$	82,293

Depreciation and amortization expense was $10.1 million and $14.4 million for the three months ended April 30, 2016 and 2017.

Intangible Assets, Net

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



	As of January 31, 2017			As of April 30, 2017
Technology patents	$	10,125		$	10,125
Accumulated amortization	(3,565		)	(3,941		)
Intangible assets, net	$	6,560		$	6,184

Intangible assets amortization expense was $326,000 and $376,000 for the three months ended April 30, 2016 and 2017. The weighted-average remaining useful life of technology patents is 4.1 years. Due to the defensive nature of these patents, the amortization is included in general and administrative expenses in the condensed consolidated statements of operations.

As of April 30, 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	$	1,128
2019	1,504
2020	1,504
2021	1,504
2022	544
Total	$	6,184

Accrued Expenses and Other Liabilities

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



	As of January 31, 2017		As of April 30, 2017
Sales and use tax payable	$	540	$	292
Accrued professional fees	1,765		1,018
Accrued marketing	6,718		5,041
Accrued travel and entertainment expenses	2,235		3,015
Income tax payable	1,135		1,271
Other accrued liabilities	9,304		5,344
Total accrued expenses and other liabilities	$	21,697	$	15,981