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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 27, 2014
Postemployment Benefits [Abstract]  
Summary of Company's Stock Option and Restricted Stock Unit Activity
The following table summarizes the Company’s stock option and RSU unit activity during the six months ended June 27, 2014 (in thousands, except per share amounts):
 
 
 
Stock Options Outstanding
 
Restricted Stock Units Outstanding
 
Shares
Available for
Grant
 
Number
of
Shares
 
Weighted
Average
Exercise Price
 
Number
of
Units
 
Weighted
Average
Grant
Date Fair
Value
Balance at December 31, 2013
8,752

 
7,885

 
$
6.92

 
3,018

 
$
6.34

Authorized
—

 
—

 
—

 
—

 
—

Granted
(3,195
)
 
1,349

 
6.49

 
1,230

 
6.55

Options exercised
—

 
(199
)
 
5.25

 
—

 
—

Shares released
—

 
—

 
—

 
(1,187
)
 
6.22

Forfeited or cancelled
1,296

 
(1,285
)
 
8.43

 
(132
)
 
6.26

Balance at June 27, 2014
6,853

 
7,750

 
$
6.64

 
2,929

 
$
6.48
Summary of Stock Options Outstanding
The following table summarizes information about stock options outstanding as of June 27, 2014 (in thousands, except per share amounts):
 
Number
of
Shares
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Term (Years)
 
Aggregate
Intrinsic
Value
Vested and expected to vest
7,359

 
$
6.65

 
3.8
 
$
8,610

Exercisable
4,807

 
6.84

 
2.7
 
5,460
Summary of Restricted Stock Units Outstanding
The following table summarizes information about restricted stock units outstanding as of June 27, 2014 (in thousands, except per share amounts):
 
Number of
Shares
Underlying
Restricted
Stock
Units
 
Weighted
Average
Remaining
Vesting
Period
(Years)
 
Aggregate
Fair
Value
Vested and expected to vest
2,691

 
0.8
 
$
20,045

The fair value of restricted stock units vested and expected to vest as of June 27, 2014 is calculated based on the fair value of the Company's common stock as of June 27, 2014.