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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 29, 2018
Disclosure of Compensation Related Costs, Share-based Payments [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 29, 2018
 
December 30, 2017
 
December 31, 2016
Cost of products sold
 
$
940

 
$
795

 
$
888

Research and development
 
4,357

 
5,245

 
7,928

Selling, general, and administrative
 
8,349

 
6,503

 
7,397

Total stock-based compensation
 
$
13,646

 
$
12,543

 
$
16,213
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 29, 2018
 
December 30, 2017
 
December 31, 2016
Employee and Director Stock Options
 
 
 
 
 
Expected volatility
39.87% to 41.11%
 
40.96% to 48.01%
 
44.2% to 50.8%
Risk-free interest rate
2.29% to 2.78%
 
1.99% to 2.09%
 
.94% to 2.06%
Expected term (years)
4.08 to 4.25
 
4.08 to 4.25
 
4.06 to 4.78
Employee Stock Purchase Plan *
 
 
 
 
 
Weighted average expected volatility
36.4%
 
—%
 
57.9%
Weighted average risk-free interest rate
1.61%
 
—%
 
0.43%
Expected term
6 months
 
n/a
 
6 months
 
 
 
 
 
 
* ESPP suspended during fiscal 2017 only
Schedule of Share-based Compensation, Stock Options, Activity
The following table summarizes the activity for our stock options and RSUs with a market or performance condition:
(Shares in thousands)
 
Unvested
 
Vested
 
Total
Balance, December 30, 2017
 
707

 
83

 
790

Granted
 
788

 
—

 
788

Vested
 
(31
)
 
31

 
—

Exercised
 
—

 
(104
)
 
(104
)
Canceled
 
(555
)
 
(10
)
 
(565
)
Balance, December 29, 2018
 
909

 
—

 
909

The following table summarizes our stock option activity and related information for the year ended December 29, 2018:
(Shares and aggregate intrinsic value in thousands)
Shares
 
Weighted
average
exercise price
 
Weighted average
remaining
contractual term (years)
 
Aggregate
Intrinsic Value
Balance, December 30, 2017
12,939

 
$
5.76

 
 
 
 
Granted
843

 
7.61

 
 
 
 
Exercised
(4,882
)
 
5.79

 
 
 
 
Forfeited or expired
(2,284
)
 
5.87

 
 
 
 
Balance, December 29, 2018
6,616

 
$
5.94

 
 
 
 
Vested and expected to vest at December 29, 2018
6,616

 
$
5.94

 
4.26
 
$
6,788

Exercisable, December 29, 2018
3,122

 
$
5.70

 
2.82
 
$
3,668
Schedule of Nonvested Restricted Stock Units Activity
The following table summarizes our RSU activity for the year ended December 29, 2018:
(Shares in thousands)
Shares
 
Weighted average grant date fair value
Balance, December 30, 2017
2,766

 
$
5.85

Granted
3,498

 
8.02

Vested
(1,124
)
 
5.97

Forfeited or expired
(728
)
 
5.90

Balance, December 29, 2018
4,412

 
$
7.53
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 29, 2018
 
December 30, 2017
 
December 31, 2016
Executive stock options with a market condition
Expected volatility
n/a
 
41%
 
46%
Risk-free interest rate
n/a
 
1.9%
 
1.1%
Expected term (years)
n/a
 
4.5
 
4.5
Executive RSUs with a market or performance condition
Expected volatility
41.06% to 41.74%
 
n/a
 
n/a
Risk-free interest rate
2.71% to 2.87%
 
n/a
 
n/a
Expected term (years)
3.00 to 3.16
 
n/a
 
n/a