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Balance Sheet Components
 12 Months Ended
Dec. 29, 2018
Balance Sheet Components [Abstract]  
Balance Sheet Components
Balance Sheet Components

Marketable Securities
Marketable securities consisted of the following (in thousands):
December 29, 2018
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
U.S. Treasuries
$
7,997

 
$
1

 
$
(1
)
 
$
7,997

Commercial paper
2,296

 
—

 
(1
)
 
2,295

Corporate bond
30,833

 
1

 
(160
)
 
30,674

Certificate of deposit
960

 
—

 
(3
)
 
957

Agency securities
8,667

 
—

 
(59
)
 
8,608

 
$
50,753

 
$
2

 
$
(224
)
 
$
50,531

December 30, 2017
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
U.S. Treasuries
$
3,968

 
$
—

 
$
(5
)
 
$
3,963

Commercial paper
3,000

 
—

 
—

 
3,000

Corporate bond
30,785

 
1

 
(150
)
 
30,636

Certificate of deposit
960

 
—

 
(3
)
 
957

Agency securities
10,489

 
—

 
(57
)
 
10,432

 
$
49,202

 
$
1

 
$
(215
)
 
$
48,988



We classify our marketable securities as available-for-sale. All marketable securities represent the investment of funds available for current operations, notwithstanding their contractual maturities. Such marketable securities are recorded at fair value and unrealized gains and losses are recorded in Accumulated other comprehensive income (loss) until realized.

We typically invest in highly-rated securities with low probabilities of default. Our investment policy requires investments to be rated single A or better, limits the types of acceptable investments, concentration as to security holder and duration of the investment. The gross unrealized gains and losses in fiscal 2018 and 2017 were caused primarily by changes in interest rates.

The longer the duration of marketable securities, the more susceptible they are to changes in market interest rates and bond yields. As yields increase, those securities with a lower yield-at-cost show a mark-to-market unrealized loss. We anticipate recovering the full cost of the securities either as market conditions improve, or as the securities mature. Accordingly, we believe that the unrealized losses are not other-than-temporary. When evaluating the investments for other-than-temporary impairment, we review factors such as the length of time and extent to which fair value has been below the amortized cost basis, current market liquidity, interest rate risk, the financial condition of the issuer, and credit rating downgrades. As of December 29, 2018 and December 30, 2017, $0.1 million and none, respectively, of our investments had been in a continuous loss position for 12 months or more.

The contractual maturities of marketable securities were as follows (in thousands):
 
December 29, 2018
 
December 30, 2017
 
Amortized Cost
 
Fair Value
 
Amortized Cost
 
Fair Value
Due in one year or less
$
35,269

 
$
35,172

 
$
23,009

 
$
22,966

Due after one year to five years
15,484

 
15,359

 
26,193

 
26,022

 
$
50,753

 
$
50,531

 
$
49,202

 
$
48,988



See also Note 9.

Inventories, net
Inventories consisted of the following (in thousands):
 
December 29, 2018
 
December 30, 2017
Raw materials
$
43,380

 
$
33,101

Work-in-progress
20,431

 
20,134

Finished goods
13,895

 
14,613

 
$
77,706

 
$
67,848



Property, Plant and Equipment, net
Property, plant and equipment, net consisted of the following (in thousands):
 
December 29, 2018
 
December 30, 2017
Machinery and equipment
$
192,108

 
$
183,186

Computer equipment and software
32,906

 
32,841

Furniture and fixtures
6,478

 
6,478

Leasehold improvements
75,285

 
73,978

Sub-total
306,777

 
296,483

Less: Accumulated depreciation and amortization
(263,102
)
 
(255,755
)
Net property, plant and equipment
43,675

 
40,728

Construction-in-progress
10,379

 
6,026

Total
$
54,054

 
$
46,754



In fiscal 2018 and 2017, asset impairment charges were immaterial. See Note 7 for a discussion of asset impairment charges recorded in fiscal 2016.

Accrued Liabilities
Accrued liabilities consisted of the following (in thousands):
 
December 29, 2018
 
December 30, 2017
Accrued compensation and benefits
$
15,600

 
$
18,141

Accrued employee stock purchase plan contributions withheld
3,174

 
3,279

Accrued warranty
2,102

 
3,662

Accrued income and other taxes
4,222

 
3,965

Other accrued expenses
2,633

 
4,647

 
$
27,731

 
$
33,694