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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 28, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of Stock-Based Compensation Expense
Total stock-based compensation expense included in our Consolidated Statements of Operations is presented in the following table:
 
 
Year Ended
(In thousands)
 
December 28, 2019
 
December 29, 2018
 
December 30, 2017
Cost of revenue
 
$
1,422

 
$
940

 
$
795

Research and development
 
5,640

 
4,357

 
5,245

Selling, general, and administrative
 
11,837

 
8,349

 
6,503

Total stock-based compensation
 
$
18,899

 
$
13,646

 
$
12,543
Schedule of Share-based Payment Award, Stock Options and Employee Stock Purchase Plan, Valuation Assumptions
The following table summarizes the assumptions used in the valuation of stock option and ESPP compensation:
 
Year Ended
 
December 28, 2019
 
December 29, 2018
 
December 30, 2017
Employee and Director Stock Options *
 
 
 
 
 
Expected volatility
n/a
 
39.87% to 41.11%
 
40.96% to 48.01%
Risk-free interest rate
n/a
 
2.29% to 2.78%
 
1.99% to 2.09%
Expected term (years)
n/a
 
4.08 to 4.25
 
4.08 to 4.25
Employee Stock Purchase Plan **
 
 
 
 
 
Weighted average expected volatility
31.6%
 
36.4%
 
n/a
Weighted average risk-free interest rate
2.51%
 
1.61%
 
n/a
Expected term
6 months
 
6 months
 
n/a
 
 
 
 
 
 
* No stock options granted during fiscal 2019
** ESPP suspended during fiscal 2017 only
Schedule of Share-based Compensation, Stock Options, Activity
The following table summarizes our stock option activity and related information for the year ended December 28, 2019:
(Shares and aggregate intrinsic value in thousands)
Shares
 
Weighted
average
exercise price
 
Weighted average
remaining
contractual term (years)
 
Aggregate
Intrinsic Value
Balance, December 29, 2018
6,616

 
$
5.94

 
 
 
 
Granted
—

 
—

 
 
 
 
Effect of vesting multiplier
36

 
 
 
 
 
 
Exercised
(2,715
)
 
5.73

 
 
 
 
Forfeited or expired
(605
)
 
5.72

 
 
 
 
Balance, December 28, 2019
3,332

 
$
6.16

 
 
 
 
Vested and expected to vest at December 28, 2019
3,332

 
$
6.16

 
4.50
 
$
43,553

Exercisable, December 28, 2019
1,721

 
$
6.00

 
3.95
 
$
22,758

The following table summarizes the activity for our stock options and RSUs with a market condition or performance condition:
(Shares in thousands)
 
Unvested
 
Vested
 
Total
Balance, December 29, 2018
 
909

 
—

 
909

Granted
 
584

 
—

 
584

Effect of vesting multiplier
 
260

 
—

 
260

Vested
 
(484
)
 
71

 
(413
)
Exercised
 
—

 
(71
)
 
(71
)
Canceled
 
(106
)
 
—

 
(106
)
Balance, December 28, 2019
 
1,163

 
—


1,163
Schedule of Nonvested Restricted Stock Units Activity
The following table summarizes our RSU activity for the year ended December 28, 2019:
(Shares in thousands)
Shares
 
Weighted average grant date fair value
Balance, December 29, 2018
4,412

 
$
7.53

Granted
2,445

 
16.23

Effect of vesting multiplier
216

 
—

Vested
(1,734
)
 
8.10

Forfeited or expired
(564
)
 
7.27

Balance, December 28, 2019
4,775

 
$
12.23
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The following table summarizes the assumptions used in the valuation of stock options and RSUs with a market or performance condition:
 
Year Ended
 
December 28, 2019
 
December 29, 2018
 
December 30, 2017
Executive stock options with a market condition
Expected volatility
n/a
 
n/a
 
41%
Risk-free interest rate
n/a
 
n/a
 
1.9%
Expected term (years)
n/a
 
n/a
 
4.5
Executive RSUs with a market or performance condition
Expected volatility
40.15% to 41.10%
 
41.06% to 41.74%
 
n/a
Risk-free interest rate
1.66% to 2.55%
 
2.71% to 2.87%
 
n/a
Expected term (years)
3.00
 
3.00 to 3.16
 
n/a