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Stock-Based Compensation Expense (Tables)
 3 Months Ended
Apr. 05, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock Option Activity
The following table summarizes the Company’s stock option activity for the three-month period ended April 5, 2015:
 
Shares
(in thousands)
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Term (in years)
 
Aggregate
Intrinsic
Value
(in thousands)
Outstanding as of December 31, 2014
6,812

 
$
23.26

 
 
 
 
Granted
1,399

 
41.26

 
 
 
 
Exercised
(586
)
 
16.49

 
 
 
 
Forfeited or expired
(24
)
 
9.20

 
 
 
 
Outstanding as of April 5, 2015
7,601

 
$
27.07

 
7.6
 
$
178,001

Exercisable as of April 5, 2015
3,137

 
$
16.59

 
5.8
 
$
106,335

Options vested or expected to vest as of 
 April 5, 2015 (1)
6,732

 
$
25.79

 
7.4
 
$
166,252

 (1) In addition to the vested options, the Company expects a portion of the unvested options to vest at some point in the future. Options expected to vest are calculated by applying an estimated forfeiture rate to the unvested options.
Weighted-Average Assumptions Used in Estimating Fair Values of Stock Options Granted
The fair values of stock options granted in each period presented were estimated using the following weighted-average assumptions:
 
Three-months Ended
 
April 5, 2015
 
March 30, 2014
Risk-free rate
2.1
%
 
2.7
%
Expected dividend yield
1.25
%
 
—
%
Expected volatility
40
%
 
41
%
Expected term (in years)
5.4

 
5.4
Nonvested Restricted Stock Shares Activity
The following table summarizes the Company's restricted stock award activity:
 
Shares (in thousands)
 
Weighted-Average Exercise Price
 
Aggregate Intrinsic Value (in thousands)
Nonvested as of December 31, 2014
20

 
$
34.05

 
 
Granted
—

 
—

 
 
Vested
—

 
—

 
 
Forfeited or expired
—

 
—

 
 
Nonvested as of April 5, 2015
20

 
$
34.05

 
$
329
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
The following table details the stock-based compensation expense by caption for each period presented on the Consolidated Statements of Operations (in thousands):
 
Three-months Ended
 
April 5, 2015
 
March 30, 2014
Product cost of revenue
$
420

 
$
285

Service cost of revenue
73

 
63

Research, development, and engineering
1,848

 
1,056

Selling, general, and administrative
4,605

 
2,600

 
$
6,946

 
$
4,004