Balance sheet components

Inventory

Inventory consisted of the following:



(in thousands)	June 30, 2015		December 31, 2014
Components	$	8,480	$	4,324
Finished goods	210,792		148,702
Total inventory	$	219,272	$	153,026

Property and equipment, net

Property and equipment, net consisted of the following:



(in thousands)	Useful life (in years)	June 30, 2015			December 31, 2014
Leasehold improvements	3–7	$	23,360		$	22,787
Computers, software, equipment and furniture	2–4	40,530			24,636
Tooling	1–2	19,050			16,159
Construction in progress		2,719			3,944
Tradeshow equipment and other	2-5	4,160			3,830
Gross property and equipment		89,819			71,356
Less: Accumulated depreciation and amortization		(37,567		)	(29,800)
Property and equipment, net		$	52,252		$	41,556

Acquisitions and acquired intangible assets and goodwill

During the six months ended June 30, 2015, the Company completed several acquisitions for an aggregate cash consideration of $59.3 million that were accounted for as business combinations. These acquisitions were not material to the Company's condensed consolidated financial statements, either individually or in the aggregate, and therefore actual and proforma disclosures under the applicable accounting guidance have not been presented.

The following table summarizes the preliminary allocation of the fair values of the assets acquired and liabilities assumed, and the related useful lives, where applicable:



(in thousands)	Estimated useful life (in years)	Fair value
Developed technology	4 - 6 years	$	19,800
In-process research and development		6,000
Liabilities assumed		(71		)
Deferred tax liabilities		(3,284		)
Net assets acquired		22,445
Goodwill		36,902
Total fair value consideration		$	59,347

Goodwill represents the excess of the purchase price over the fair value of the net assets acquired and is primarily attributable to expected synergies in the technologies that can be leveraged by the Company in future product offerings. Goodwill is not expected to be deductible for tax purposes.

The following table summarizes the Company's acquired intangible assets:




	June 30, 2015							December 31, 2014
(in thousands)	Gross carrying amount		Accumulated amortization			Net carrying amount		Net carrying amount
Finite-lived acquired intangible assets	$	27,075	$	(5,563	)	$	21,512	$	2,922
Indefinite-lived acquired intangible assets	6,015		—			6,015		15
Total intangible assets	$	33,090	$	(5,563	)	$	27,527	$	2,937

Amortization expense for the six months ended June 30, 2015 and 2014 was $1.2 million and $0.6 million, respectively. Estimated amortization expense for future periods as of June 30, 2015, is as follows:



(in thousands)	Total
Year ending December 31,
Remainder of 2015	$	2,465
2016	4,768
2017	3,984
2018	3,592
2019	3,081
Thereafter	3,622
	$	21,512

The carrying amount of goodwill was $51.0 million and $14.1 million as of June 30, 2015 and December 31, 2014, respectively. The increase during the six months ended June 30, 2015 was entirely attributable to goodwill acquired. The Company did not have any goodwill impairments during the periods presented.