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Balance Sheet Components
6 Months Ended
Jun. 28, 2015
Balance Sheet Related Disclosures [Abstract]  
Balance Sheet Components
Balance Sheet Components

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

 
As of
 
June 28, 2015
 
December 31, 2014
 
Cost
 
Unrealized Gain
 
Unrealized Loss
 
Estimated Fair Value
 
 Cost
 
Unrealized Gain
 
Unrealized Loss
 
Estimated Fair Value
U.S. treasuries
$
74,972

 
$
19

 
$

 
$
74,991

 
$
114,944

 
$
6

 
$
(15
)
 
$
114,935

Certificates of deposit
151

 

 

 
151

 
158

 

 

 
158

Total
$
75,123

 
$
19

 
$

 
$
75,142

 
$
115,102

 
$
6

 
$
(15
)
 
$
115,093



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
 
June 28,
2015
 
December 31,
2014
Gross accounts receivable
$
263,877

 
$
296,239

Allowance for doubtful accounts
(1,255
)
 
(1,255
)
Allowance for sales returns
(13,704
)
 
(17,489
)
Allowance for price protection
(2,425
)
 
(1,806
)
Total allowances
(17,384
)
 
(20,550
)
Total accounts receivable, net
$
246,493

 
$
275,689



Inventories (in thousands)
 
As of
 
June 28,
2015
 
December 31,
2014
Raw materials
$
3,338

 
$
3,625

Work in process


8

Finished goods
185,330

 
219,250

Total inventories
$
188,668

 
$
222,883



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
 
June 28,
2015
 
December 31,
2014
Computer equipment
$
10,002

 
$
9,779

Furniture, fixtures and leasehold improvements
17,984

 
19,379

Software
29,908

 
29,294

Machinery and equipment
63,391

 
60,135

Total property and equipment, gross
121,285

 
118,587

Accumulated depreciation and amortization
(95,694
)
 
(88,893
)
Total property and equipment, net
$
25,591

 
$
29,694



Depreciation and amortization expense pertaining to property and equipment was $4.6 million and $9.4 million for the three and six months ended June 28, 2015, respectively, and $4.2 million and $8.5 million for the three and six months ended June 29, 2014, respectively.

Intangibles, net (in thousands)
 
Gross
 
Accumulated Amortization
 
Net
June 28, 2015
 
 
 
 
 
Technology
$
61,099

 
$
(44,067
)
 
$
17,032

Customer contracts and relationships
56,500

 
(19,748
)
 
36,752

Other
10,545

 
(6,895
)
 
3,650

Total intangibles, net
$
128,144

 
$
(70,710
)
 
$
57,434


 
Gross
 
Accumulated Amortization
 
Net
December 31, 2014
 
 
 
 
 
Technology
$
61,099

 
$
(39,341
)
 
$
21,758

Customer contracts and relationships
56,500

 
(16,205
)
 
40,295

Other
10,545

 
(6,368
)
 
4,177

Total intangibles, net
$
128,144

 
$
(61,914
)
 
$
66,230



Amortization of intangibles was $4.3 million and $8.8 million for the three and six months ended June 28, 2015, respectively, and $4.4 million and $8.9 million for the three and six months ended June 29, 2014, 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
2015 (remaining six months)
$
8,487

2016
16,921

2017
11,386

2018
7,871

2019
6,028

Thereafter
6,741

Total estimated amortization expense
$
57,434



Other non-current assets (in thousands)
 
As of
 
June 28,
2015
 
December 31, 2014
Non-current deferred income taxes
$
39,396

 
$
38,696

Cost method investment
1,322

 
1,322

Other
7,634

 
8,059

Total other non-current assets
$
48,352

 
$
48,077



Other accrued liabilities (in thousands)
 
As of
 
June 28,
2015
 
December 31,
2014
Sales and marketing programs
$
44,689

 
$
54,582

Warranty obligation
40,967

 
44,888

Freight
4,490

 
6,827

Other
33,701

 
37,445

Total other accrued liabilities
$
123,847

 
$
143,742