4. Balance Sheet Details

Balance sheet components consist of the following:

	December 31,			June 30,
	2016			2016
	(in thousands)
Inventories:
Raw materials	$	57		$	57
Distributor inventory		1,138			1,677
Finished goods		14,570			10,754
Total inventories	$	15,765		$	12,488

Property and equipment:
Computer equipment and tooling	$	34,909		$	33,739
Computer rental equipment		20,358			17,194
Software		7,771			7,328
Furniture and fixtures		3,805			3,880
Leasehold improvements and others		9,698			8,836
Total property and equipment		76,541			70,977
Less accumulated depreciation and amortization		(55,722	)		(49,426	)
Property and equipment, net	$	20,819		$	21,551

Deferred revenue:
Product	$	3,763		$	5,433
Support and services		59,953			59,465
Hosted and related services		13,718			12,807
Total deferred revenue	$	77,434		$	77,705

Depreciation expense for the three months ended December 31, 2016 and 2015 was $3.4 million and $2.8 million, respectively. Depreciation expense for the six months ended December 31, 2016 and 2015 was $6.6 million and $5.7 million, respectively.

Intangible Assets:

Intangible assets consist of the following (in thousands):

	December 31, 2016							June 30, 2016
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Patents	$	4,446	$	(4,027	)	$	419	$	4,446	$	(3,919	)	$	527
Technology		31,434		(25,763	)		5,671		31,434		(23,523	)		7,911
Customer relationships		24,700		(16,303	)		8,397		24,700		(14,513	)		10,187
Intangible assets in process and other		178		(30	)		148		178		(15	)		163
Intangible assets	$	60,758	$	(46,123	)	$	14,635	$	60,758	$	(41,970	)	$	18,788

The intangible assets that are amortizable have estimated useful lives of two to eight years.

Amortization of intangible assets for the three months ended December 31, 2016 and 2015 was $2.1 million and $2.0 million, respectively. Amortization of intangible assets for the six months ended December 31, 2016 and 2015 was $4.2 million and $3.9 million, respectively.

The estimated amortization expenses for intangible assets as of December 31, 2016 for the next five years and thereafter are as follows (in thousands):

Years Ending June 30,
2017 (remaining 6 months)	$	3,355
2018		5,513
2019		4,010
2020		1,267
2021		477
Thereafter		13
Total	$	14,635

Short-Term Investments:

The following tables summarize the Company’s short-term investments (in thousands):

	December 31, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Corporate bonds and commercial paper	$	20,002	$	-	$	(37	)	$	19,965
U.S. Government agency securities		29,216		-		(33	)		29,183
Total short-term investments	$	49,218	$	-	$	(70	)	$	49,148

	June 30, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Corporate bonds and commercial paper	$	26,359	$	9	$	(5	)	$	26,363
U.S. Government agency securities		20,038		32		-			20,070
Total short-term investments	$	46,397	$	41	$	(5	)	$	46,433

The following table summarizes the maturities of the Company’s fixed income securities (in thousands):

	December 31, 2016
	Amortized Cost		Fair Value

Less than 1 year	$	35,041	$	35,008
Due in 1 to 3 years		14,177		14,140
Total	$	49,218	$	49,148

	June 30, 2016
	Amortized Cost		Fair Value

Less than 1 year	$	28,107	$	28,114
Due in 1 to 3 years		18,290		18,319
Total	$	46,397	$	46,433

All available-for-sale securities have been classified as current based on management’s ability to use the funds in current operations. Actual maturities may differ from the contractual maturities because borrowers may have the right to call or prepay certain obligations.