Balance Sheet Components (in thousands)

Available-For-Sale Short-Term Investments



	As of
	March 30, 2014								December 31, 2013
	Cost		Unrealized Gain		Unrealized Loss		Estimated Fair Value		Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
U.S. Treasuries	$	109,946	$	13	$	—	$	109,959	$	104,595	$	7	$	(1	)	$	104,601
Certificates of Deposits	174		—		—		174		159		—		—			159
Total	$	110,120	$	13	$	—	$	110,133	$	104,754	$	7	$	(1	)	$	104,760

The Company’s short-term investments are partially comprised of marketable securities that are classified as available-for-sale and consist of government securities with an original maturity or remaining maturity at the time of purchase of greater than three months and no more than 12 months. Accordingly, none of the available-for-sale securities have unrealized losses greater than 12 months.

Cost Method Investments

As of March 30, 2014 and December 31, 2013, the carrying value of the Company's cost method investments was $1.3 million. These investments are included in other non-current assets in the consolidated balance sheets and are carried at cost, adjusted for any impairment, because the Company does not have a controlling interest and does not have the ability to exercise significant influence over these companies. The Company monitors these investments for impairment on a quarterly basis, and adjusts carrying value for any impairment charges recognized. There were no impairments recognized in the three months ended March 30, 2014 and March 31, 2013. Realized gains and losses on these investments are reported in other income, net in the consolidated statements of operations.

Accounts receivable, net



	As of
	March 30, 2014			December 31, 2013
Gross accounts receivable	$	314,432		$	289,479
Allowance for doubtful accounts	(1,255		)	(1,255		)
Allowance for sales returns	(18,550		)	(17,467		)
Allowance for price protection	(3,376		)	(4,273		)
Total allowances	(23,181		)	(22,995		)
Total accounts receivable, net	$	291,251		$	266,484

Inventories



	As of
	March 30, 2014		December 31, 2013
Raw materials	$	6,591	$	8,676
Work in process	5,244		6,233
Finished goods	189,795		209,547
Total inventories	$	201,630	$	224,456

The Company records provisions for excess and obsolete inventory based on forecasts of future demand. While management believes the estimates and assumptions underlying its current forecasts are reasonable, there is risk that additional charges may be necessary if current forecasts are greater than actual demand.

Property and equipment, net



	As of
	March 30, 2014			December 31, 2013
Computer equipment	$	8,728		$	8,527
Furniture, fixtures and leasehold improvements	14,169			14,019
Software	25,875			25,722
Machinery and equipment	53,270			50,656
Construction in progress	12			21
Total property and equipment, gross	102,054			98,945
Accumulated depreciation and amortization	(76,049		)	(71,751		)
Total property and equipment, net	$	26,005		$	27,194

Depreciation and amortization expense pertaining to property and equipment was $4.3 million and $3.4 million for the three months ended March 30, 2014 and March 31, 2013, respectively.

Intangibles, net

The following tables present details of the Company’s purchased intangible assets:



	Gross		Accumulated Amortization			Net
March 30, 2014
Technology	$	60,999	$	(32,026	)	$	28,973
Customer contracts and relationships	56,500		(10,892		)	45,608
Other	10,545		(5,577		)	4,968
Finite-lived intangibles, net	128,044		(48,495		)	79,549
Indefinite-lived intangible assets	100		—			100
Total purchased intangible assets, net	$	128,144	$	(48,495	)	$	79,649



	Gross		Accumulated Amortization			Net
December 31, 2013
Technology	$	60,999	$	(29,593	)	$	31,406
Customer contracts and relationships	56,500		(9,120		)	47,380
Other	10,545		(5,313		)	5,232
Finite-lived intangibles, net	128,044		(44,026		)	84,018
Indefinite-lived intangible assets	100		—			100
Total purchased intangible assets, net	$	128,144	$	(44,026	)	$	84,118

As of March 30, 2014, the Company had $0.1 million in indefinite-lived intangible assets. This balance relates to the remaining IPR&D assets acquired in connection with the Company's acquisition of AirCard. IPR&D assets represent IPR&D projects that have not reached technical feasibility and are required to be classified as indefinite-lived assets until the successful completion or abandonment of the associated research and development efforts. Accordingly, during the development period after the date of acquisition, these assets will not be amortized. When the asset reaches technical feasibility, the Company will determine the useful life of the asset, reclassify the asset out of IPR&D, and begin amortization. Development costs incurred after acquisition on acquired IPR&D projects are expensed as incurred.

Amortization of purchased intangible assets was $4.5 million and $1.5 million for the three months ended March 30, 2014 and March 31, 2013, respectively.

Estimated amortization expense related to intangibles for each of the next five years and thereafter is as follows:



Year Ending December 31	Amount
2014 (remaining nine months)	$	13,406
2015	17,258
2016	16,896
2017	11,361
2018	7,859
Thereafter	12,769
Total expected amortization expense	$	79,549

Goodwill

The changes in the carrying amount of goodwill during the three months ended March 30, 2014 are as follows:



	Retail		Commercial		Service Provider		Total
Goodwill at December 31, 2013	$	45,441	$	36,279	$	74,196	$	155,916
Goodwill acquired during the period	—		—		—		—
Goodwill at March 30, 2014	$	45,441	$	36,279	$	74,196	$	155,916

There were no impairments to goodwill during three months ended March 30, 2014 and March 31, 2013.

Other non-current assets



	As of
	March 30, 2014		December 31, 2013
Non-current deferred income taxes	$	19,630	$	20,235
Cost method investment	1,322		1,322
Other	8,870		5,034
Total other non-current assets	$	29,822	$	26,591

Other accrued liabilities



	As of
	March 30, 2014		December 31, 2013
Sales and marketing programs	$	50,870	$	47,941
Warranty obligation	45,403		48,754
Freight	5,777		5,790
Other	39,002		40,733
Total other accrued liabilities	$	141,052	$	143,218