(4) Balance Sheet Components

Short Term Investments

The Company did not have any investments as of January 31, 2017. Unrealized gains or losses from the Company’s short-term investments were immaterial as of July 31, 2017. There was no other-than-temporary impairment for these investments as of July 31, 2017.

The following table summarizes the fair value of the Company’s available for sale investments as of July 31, 2017 (in thousands):

	As of July 31, 2017
	Carrying Amount		Fair Value
Due within one year	$	7,926	$	7,926
Total	$	7,926	$	7,926

Property and Equipment, net

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

	As of January 31,			As of July 31,
	2017			2017
Computer equipment	$	17,431		$	19,508
Leasehold improvements		5,941			5,944
Sales demonstration equipment		5,903			6,098
Beta equipment		1,060			1,516
Furniture and fixtures		1,550			1,657
Software		649			660
Construction in progress		39			77
Total property and equipment		32,573			35,460
Less accumulated depreciation and amortization		(22,163	)		(25,460	)
Total property and equipment, net	$	10,410		$	10,000

Depreciation and amortization expense related to property and equipment for the six months ended July 31, 2016 and 2017 was $4.8 million and $3.6 million, respectively. Depreciation and amortization expense related to property and equipment for the three months ended July 31, 2016 and 2017 was $2.5 million and $1.7 million, respectively.

At the beginning of the year ended January 31, 2016, the Company substantially ceased its customer evaluation inventory program and initiated its sales demonstration equipment program. As a result, evaluation units in the Company’s sales demonstration equipment program are subject to depreciation over their useful life on a straight line basis. For the six months ended July 31, 2016 and 2017, depreciation expense for sales demonstration equipment was $1.7 million and $0.7 million, respectively, and is included in sales and marketing expense in the consolidated statements of operations. For the three months ended July 31, 2016 and 2017, depreciation expense for sales demonstration equipment was $0.9 million and $0.3 million, respectively, and is included in sales and marketing expense in the consolidated financial statements.

Accrued and Other Current Liabilities

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

	As of January 31,		As of July 31,
	2017		2017
Accrued sales and use taxes payable	$	1,697	$	1,830
Accrued sales commissions		4,706		2,325
Accrued bonus		2,427		2,416
Accrued vacation		3,561		4,018
Other accruals		8,277		9,136
Total accrued and other current liabilities	$	20,668	$	19,725