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Stockholders' Equity (Tables)
12 Months Ended
Dec. 28, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of Common Stock Reserved for Future Issuance
Common stock reserved for future issuance was as follows (in thousands):
 
December 28, 2019
Outstanding stock options and awards
14,835

Reserved for future option and award grants
8,149

Reserved for future ESPP
12,438

Total common stock reserved for stock options and awards
35,422

Schedule of Company's Equity Award Activity - Options The following tables summarize the Company’s equity award activity and related information (in thousands, except per share data):  
 
Number of
Options
 
Weighted-Average
Exercise Price
Per Share
 
Aggregate
Intrinsic
Value
Outstanding at December 31, 2016
1,655

 
$
8.30

 
$
965

Options granted

 
$

 

Options exercised
(196
)
 
$
7.78

 
$
373

Options canceled
(62
)
 
$
14.11

 

Outstanding at December 30, 2017
1,397

 
$
8.11

 
$
1

Options granted

 
$

 


Options exercised
(229
)
 
$
7.43

 
$
496

Options canceled
(53
)
 
$
11.57

 


Outstanding at December 29, 2018
1,115

 
$
8.09

 
$

Options granted

 
$

 
 
Options exercised

 
$

 
$

Options canceled
(385
)
 
$
7.47

 
 
Outstanding at December 28, 2019
730

 
$
8.41

 
$

Exercisable at December 28, 2019
730

 
$
8.41

 
$


Schedule of Company's Equity Award Activity - RSUs
 
Number of
Restricted
Stock Units
 
Weighted-Average
Grant Date
Fair Value
Per Share
 
Aggregate
Intrinsic
Value
Outstanding at December 31, 2016
5,293

 
$
14.10

 
$
44,939

RSUs granted
4,281

 
$
9.66

 

RSUs released
(2,198
)
 
$
13.56

 
$
20,791

RSUs canceled
(585
)
 
$
13.24

 

Outstanding at December 30, 2017
6,791

 
$
11.55

 
$
42,988

RSUs granted
3,756

 
$
10.52

 


RSUs released
(2,642
)
 
$
12.12

 
$
26,457

RSUs canceled
(1,159
)
 
$
11.12

 


Outstanding at December 29, 2018
6,746

 
$
10.83

 
$
26,446

RSUs granted
8,950

 
$
4.36

 


RSUs released
(2,784
)
 
$
10.48

 
$
12,901

RSUs canceled
(1,312
)
 
$
8.37

 
 
Outstanding at December 28, 2019
11,600

 
$
6.20

 
$
90,254


Schedule of Company's Equity Award Activity - PSUs
 
Number of
Performance
Stock Units
 
Weighted-Average
Grant Date
Fair Value Per Share
 
Aggregate
Intrinsic
Value
Outstanding at December 31, 2016
904

 
$
14.13

 
$
7,672

PSUs granted
916

 
$
10.88

 

PSUs released
(26
)
 
$
11.83

 
$
225

PSUs canceled
(427
)
 
$
12.20

 

Outstanding at December 30, 2017
1,367

 
$
16.28

 
$
8,651

PSUs granted
521

 
$
9.79

 


PSUs released
(55
)
 
$
15.93

 
$
411

PSUs canceled
(704
)
 
$
16.01

 


Outstanding at December 29, 2018
1,129

 
$
16.10

 
$
4,425

PSUs granted
2,202

 
$
4.63

 


PSUs released
(99
)
 
$
11.11

 
$
472

PSUs canceled
(727
)
 
$
14.42

 
 
Outstanding at December 28, 2019
2,505

 
$
6.48

 
$
19,485

Expected to vest as of December 28, 2019
2,392

 
 
 
$
18,613


Schedule of Stock-based Compensation Cost for Instruments Granted But Not Yet Amortized
The following table presents total stock-based compensation cost for instruments granted but not yet amortized, net of estimated forfeitures, of the Company’s equity compensation plans as of December 28, 2019. These costs are expected to be amortized on a straight-line basis over the following weighted-average periods (in thousands, except for weighted-average period): 
 
Unrecognized
Compensation
Expense, Net
 
Weighted-
Average Period
(in years)
RSUs
$
50,418

 
2.10
PSUs
$
7,458

 
1.99

Schedule of Options Outstanding
The following table summarizes information about options outstanding at December 28, 2019. 
 
 
Options Outstanding
 
Vested and Exercisable
Options
Exercise Price
 
Number of
Shares
 
Weighted-
Average
Remaining
Contractual Life
 
Weighted-
Average
Exercise
Price
 
Number of
Shares
 
Weighted-
Average
Exercise
Price
 
 
(In thousands)
 
(In years)
 
 
 
(In thousands)
 
 
$6.99 - $ 7.25
 
48

 
1.40
 
$
7.03

 
48

 
$
7.03

$ 7.53
 
35

 
1.34
 
$
7.53

 
35

 
$
7.53

$ 8.01
 
93

 
0.87
 
$
8.01

 
93

 
$
8.01

$ 8.58
 
485

 
1.05
 
$
8.58

 
485

 
$
8.58

$9.02 - $9.28
 
69

 
0.01
 
$
9.19

 
69

 
$
9.19

 
 
730

 

 


 
730

 



Schedule of Estimated Fair Value of ESPP Shares
The fair value of the ESPP shares was estimated at the date of grant using the following assumptions:
 
Years Ended
 
December 28,
2019
 
December 29,
2018
 
December 30,
2017
Volatility
70% - 72%
 
48% - 62%
 
47% - 51%
Risk-free interest rate
1.76% - 2.48%
 
1.90% - 2.31%
 
0.81% - 1.16%
Expected life
0.5 years
 
0.5 years
 
0.5 years
Estimated fair value
$1.64 - $1.77
 
$2.47 - $3.13
 
$2.44 - $3.46

Schedule of Employee Stock Purchase Plan Activity
The Company’s ESPP activity for the following periods was as follows (in thousands):
 
Years Ended
 
December 28,
2019
 
December 29,
2018
 
December 30,
2017
Stock-based compensation expense
$
4,873

 
$
5,478

 
$
6,049

Employee contributions
$
12,052

 
$
15,992

 
$
16,410

Shares purchased
2,897

 
2,189

 
2,140


Schedule of Estimated Fair Value of PSU Granted
The ranges of estimated values of the PSUs granted that are compared to the SPGIIPTR, as well as the assumptions used in calculating these values were based on estimates as follows:
 
2018
 
2017
Index volatility
33%
 
33% - 34%
Infinera volatility
58% - 59%
 
55% - 56%
Risk-free interest rate
2.37% - 2.40%
 
1.41% - 1.63%
Correlation with index
0.04 - 0.48
 
0.10 - 0.49
Estimated fair value
$14.99 - $19.46
 
$15.23 - $17.35

The assumptions used in calculating the estimated values of this award granted in fiscal 2019 were based upon Monte Carlo Model Assumptions and estimates as follows:

 
2019
Index volatility
N/A
Infinera volatility
64% - 68%
Risk-free interest rate
2.17% - 2.48%
Correlation with index/index component
N/A
Estimated fair value
$2.08 - $2.89


Schedule of Nonvested Performance Based Units Activity by Grant Year
The following table summarizes by grant year, the Company’s PSU activity for the year ended December 28, 2019 (in thousands):
 
 
 
 
Grant Year
 
 
Total Number of Performance Stock Units
 
2016
 
2017
 
2018
 
2019
Outstanding at December 29, 2018
 
1,129

 
156

 
481

 
492

 

PSUs granted
 
2,202

 

 

 

 
2,202

PSUs released
 
(99
)
 

 
(26
)
 
(25
)
 
(48
)
PSUs canceled
 
(727
)
 
(156
)
 
(256
)
 
(197
)
 
(118
)
Outstanding at December 28, 2019
 
2,505

 

 
199

 
270

 
2,036


Schedule of Effects of Stock-Based Compensation on Company's Balance Sheets and Statements of Operations
The following tables summarize the effects of stock-based compensation on the Company’s consolidated balance sheets and statements of operations for the periods presented (in thousands):
 
 
Years Ended
 
December 28,
2019
 
December 29,
2018
 
December 30,
2017
Stock-based compensation effects in inventory
$
4,798

 
$
4,750

 
$
5,255

Stock-based compensation effects in net loss before income taxes
 
 
 
 
 
Cost of revenue
$
1,743

 
$
1,635

 
$
3,065

Research and development
17,457

 
16,270

 
15,845

Sales and marketing
8,413

 
10,869

 
11,288

General and administrative
10,460

 
9,649

 
10,776

 
$
38,073

 
$
38,423

 
$
40,974

Cost of revenue—amortization from balance sheet (1)
4,706

 
4,986

 
4,746

Total stock-based compensation expense
$
42,779

 
$
43,409

 
$
45,720

(1) 
Represents stock-based compensation expense deferred to inventory in prior periods and recognized in the current period.