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Share-Based Compensation (Tables)
 3 Months Ended
Mar. 30, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of stock option activity
The following table summarizes the Company’s stock option activity during the three months ended March 30, 2019:
 
Number
of
Stock
Options
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Life (Years)
 
Aggregate
Intrinsic
Value (in thousands)(1)
Outstanding at December 31, 2018
5,120,293

 
$
3.13

 
7.3
 
$
81,371

Granted
—

 
$
—

 
—
 
$
—

Exercised
(169,583
)
 
$
2.16

 
—
 
$
2,859

Cancelled/Forfeited
(50,382
)
 
$
4.34

 
—
 
$
—

Outstanding at March 30, 2019
4,900,328

 
$
3.15

 
7.0
 
$
80,076

Vested and exercisable at March 30, 2019
2,981,633

 
$
1.11

 
5.9
 
$
54,793

Vested and expected to vest at March 30, 2019
3,967,483

 
$
2.16

 
5.9
 
$
68,759

__________
(1) Aggregate intrinsic value is calculated as the difference between the value of common stock on the transaction date and the exercise price multiplied by the number of shares issuable under the stock option.
Schedule of restricted stock activity
The following table summarizes the Company’s restricted stock activity during the three months ended March 30, 2019:
 
Number
of Shares of
Restricted Stock
 
Weighted
Average
Remaining
Contractual
Life (Years)
 
Weighted
Average
Grant Date
Fair Value
Per Share
Outstanding at December 31, 2018
100,127

 
1.6
 
$
17.03

Granted
—

 
—
 
$
—

Vested/Released
(12,946
)
 
—
 
$
—

Cancelled/Forfeited
—

 
—
 
$
—

Outstanding at March 30, 2019
87,181

 
1.4
 
$
17.03