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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 30, 2017
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 30, 2017
 
December 31, 2016
 
January 2, 2016
Cost of products sold
 
$
795

 
$
888

 
$
1,416

Research and development
 
5,245

 
7,928

 
9,141

Selling, general, and administrative
 
6,503

 
7,397

 
6,793

Acquisition related charges
 
—

 
—

 
4,293

Total stock-based compensation
 
$
12,543

 
$
16,213

 
$
21,643
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 30, 2017
 
December 31, 2016
 
January 2, 2016
Employee and Director Stock Options
 
 
 
 
 
Expected volatility
40.96% to 48.01%
 
44.2% to 50.8%
 
43.6% to 47.3%
Risk-free interest rate
1.99% to 2.09%
 
.94% to 2.06%
 
1.4% to 1.7%
Expected term (years)
4.08 to 4.25
 
4.06 to 4.78
 
4.08 to 4.75
Dividend yield
—%
 
—%
 
—%
Employee Stock Purchase Plan *
 
 
 
 
 
Weighted average expected volatility
—%
 
57.9%
 
33.6%
Weighted average risk-free interest rate
—%
 
0.43%
 
0.12%
Expected term
N/A
 
6 months
 
6 months
Dividend yield
—%
 
—%
 
—%
 
 
 
 
 
 
* ESPP suspended during fiscal 2017 only
Schedule of Share-based Compensation, Stock Options, Activity
The following table summarizes the activity for our stock options with a market condition:
(Shares in thousands)
 
Unvested
 
Vested
 
Total
Balance, December 31, 2016
 
597

 
—

 
597

Granted
 
475

 
—

 
475

Vested
 
(92
)
 
92

 
—

Exercised
 
—

 
(9
)
 
(9
)
Canceled
 
(273
)
 
—

 
(273
)
Balance, December 30, 2017
 
707

 
83

 
790

The following table summarizes our stock option activity and related information for the year ended December 30, 2017:
(Shares and aggregate intrinsic value in thousands)
Shares
 
Weighted
average
exercise price
 
Weighted average
remaining
contractual term (years)
 
Aggregate
Intrinsic Value
Balance, December 31, 2016
12,566

 
$
5.70

 
 
 
 
Granted
3,732

 
5.73

 
 
 
 
Exercised
(1,803
)
 
5.07

 
 
 
 
Forfeited or expired
(1,556
)
 
6.00

 
 
 
 
Balance, December 30, 2017
12,939

 
$
5.77

 
 
 
 
Vested and expected to vest at December 30, 2017
12,939

 
$
5.77

 
4.47
 
$
3,333

Exercisable, December 30, 2017
6,601

 
$
5.81

 
2.87
 
$
2,485
Schedule of Nonvested Restricted Stock Units Activity
The following table summarizes our RSU activity for the year ended December 30, 2017:
(Shares in thousands)
Shares
 
Weighted average grant date fair value
Balance, December 31, 2016
3,247

 
$
5.90

Granted
1,530

 
5.83

Exercised
(1,478
)
 
5.95

Forfeited or expired
(533
)
 
5.84

Balance, December 30, 2017
2,766

 
$
5.85
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 condition:
 
Year Ended
 
December 30, 2017
 
December 31, 2016
 
January 2, 2016
Executive stock options with a market condition
 
 
 
 
 
Expected volatility
41%
 
46%
 
44% to 46%
Risk-free interest rate
1.9%
 
1.1%
 
1.4%
Expected term (years)
4.5
 
4.5
 
4.5
Dividend yield
—%
 
—%
 
—%
Executive RSUs with a market condition
 
 
 
 
 
Expected volatility
n/a
 
n/a
 
36.9%
Risk-free interest rate
n/a
 
n/a
 
0.6%
Expected term (years)
n/a
 
n/a
 
2.0
Dividend yield
n/a
 
n/a
 
—%