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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 28, 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 three months ended March 28, 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
(3,060
)
 
1,344

 
6.49

 
1,144

 
6.51

Options exercised
—

 
(56
)
 
4.34

 
—

 
—

Shares released
—

 
—

 
—

 
(871
)
 
6.19

Forfeited or cancelled
310

 
(398
)
 
8.83

 
(66
)
 
6.14

Balance at March 28, 2014
6,002

 
8,775

 
$
6.78

 
3,225

 
$
6.45
Summary of Stock Options Outstanding
The following table summarizes information about stock options outstanding as of March 28, 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
8,315

 
$
6.81

 
3.6
 
$
5,700

Exercisable
5,597

 
7.05

 
2.4
 
3,790
Summary of Restricted Stock Units Outstanding
The following table summarizes information about restricted stock units outstanding as of March 28, 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
2,917

 
0.9
 
$
19,955

The fair value of restricted stock units vested and expected to vest of March 28, 2014 is calculated based on the fair value of the Company's common stock as of March 28, 2014.