Balance Sheet Components

Available-for-sale short-term investments (in thousands)



	As of
	July 3, 2016								December 31, 2015
	Cost		Unrealized Gain		Unrealized Loss		Estimated Fair Value		Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
U.S. treasuries	$	125,103	$	83	$	—	$	125,186	$	95,057	$	1	$	(65	)	$	94,993
Certificates of deposit	151		—		—		151		147		—		—			147
Total	$	125,254	$	83	$	—	$	125,337	$	95,204	$	1	$	(65	)	$	95,140

The Company’s short-term investments are primarily 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.

Accounts receivable, net (in thousands)



	As of
	July 3, 2016			December 31, 2015
Gross accounts receivable	$	248,796		$	309,926
Allowance for doubtful accounts	(1,255		)	(1,255		)
Allowance for sales returns	(14,203		)	(15,904		)
Allowance for price protection	(2,788		)	(2,125		)
Total allowances	(18,246		)	(19,284		)
Total accounts receivable, net	$	230,550		$	290,642

Inventories (in thousands)



	As of
	July 3, 2016		December 31, 2015
Raw materials	$	6,371	$	4,292
Work in process	1		2
Finished goods	201,469		208,824
Total inventories	$	207,841	$	213,118

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 (in thousands)



	As of
	July 3, 2016			December 31, 2015
Computer equipment	$	11,542		$	11,161
Furniture, fixtures and leasehold improvements	19,072			18,317
Software	31,287			30,396
Machinery and equipment	69,187			66,662
Total property and equipment, gross	131,088			126,536
Accumulated depreciation and amortization	(111,815		)	(104,152		)
Total property and equipment, net	$	19,273		$	22,384

Depreciation and amortization expense pertaining to property and equipment was $4.2 million and $8.1 million for the three and six months ended July 3, 2016, respectively, and $4.6 million and $9.4 million for the three and six months ended June 28, 2015, respectively.

Intangibles, net (in thousands)



	Gross		Accumulated Amortization			Net
July 3, 2016
Technology	$	61,099	$	(52,902	)	$	8,197
Customer contracts and relationships	56,500		(26,833		)	29,667
Other	10,545		(7,950		)	2,595
Total intangibles, net	$	128,144	$	(87,685	)	$	40,459



	Gross		Accumulated Amortization			Net
December 31, 2015
Technology	$	61,099	$	(48,485	)	$	12,614
Customer contracts and relationships	56,500		(23,290		)	33,210
Other	10,545		(7,422		)	3,123
Total intangibles, net	$	128,144	$	(79,197	)	$	48,947

Amortization of intangibles was $4.3 million and $8.5 million for the three and six months ended July 3, 2016, respectively, and $4.3 million and $8.8 million for the three and six months ended June 28, 2015, respectively.

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



Year Ending December 31	Amount
2016 (remaining six months)	$	8,433
2017	11,386
2018	7,871
2019	6,028
2020	5,316
Thereafter	1,425
Total estimated amortization expense	$	40,459

Other non-current assets (in thousands)



	As of
	July 3, 2016		December 31, 2015
Non-current deferred income taxes	$	64,588	$	68,445
Other	7,299		7,929
Total other non-current assets	$	71,887	$	76,374

Other accrued liabilities (in thousands)



	As of
	July 3, 2016		December 31, 2015
Sales and marketing programs	$	52,226	$	69,693
Warranty obligation	50,393		56,706
Freight	5,998		5,748
Other	23,507		34,135
Total other accrued liabilities	$	132,124	$	166,282