Note 4. Balance Sheet Components

Property and Equipment, Net

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

	January 31,			October 31,
	2015			2015

Test equipment	$	37,059		$	58,359
Computer, equipment and software		19,022			25,158
Furniture and fixtures		2,460			2,587
Leasehold improvements		3,776			4,579
Total property and equipment		62,317			90,683
Less: accumulated depreciation and amortization		(22,458	)		(43,566	)
Property and equipment, net	$	39,859		$	47,117

Depreciation and amortization expense was $4.1 million and $8.5 million for the three months ended October 31, 2014 and October 31, 2015 and $9.2 million and $22.1 million for the nine months ended October 31, 2014 and October 31, 2015.

Intangible Assets, Net

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

	January 31, 2015			October 31, 2015

Technology patents	$	9,125		$	9,125
Accumulated amortization		(841	)		(1,819	)
Intangible assets, net	$	8,284		$	7,306

Intangible assets amortization expense was $306,000 and $326,000 for the three months ended October 31, 2014 and October 31, 2015 and $515,000 and $978,000 for the nine months ended October 31, 2014 and October 31, 2015. 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 October 31, 2015, expected amortization expense for intangible assets for each of the next five years and thereafter is as follows (in thousands):

Year Ending January 31,	Estimated Future Amortization Expense
Remainder of 2016	$	326
2017		1,304
2018		1,304
2019		1,304
2020		1,304
Thereafter		1,764
Total	$	7,306

Accrued Expenses and Other Liabilities

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

	January 31,		October 31,
	2015		2015

Sales and use tax payable	$	591	$	583
Accrued professional fees		1,502		2,149
Accrued travel and entertainment expenses		1,138		1,264
Income tax payable		779		941
Other accrued liabilities		2,096		6,786
Accrued deferred offering costs		—		2,717
Total accrued expenses and other liabilities	$	6,106	$	14,440