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Share-Based Compensation (Tables)
 9 Months Ended
Sep. 28, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of stock option activity
The following table summarizes the Company’s stock option activity during the nine months ended September 28, 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
1,493,105

 
$
36.61

 
—
 
$
—

Exercised
(442,604
)
 
$
2.06

 
—
 
$
33,440

Cancelled/Forfeited
(83,625
)
 
$
8.67

 
—
 
$
—

Outstanding at September 28, 2019
6,087,169

 
$
11.34

 
7.3
 
$
838,191

Vested and exercisable at September 28, 2019
3,233,150

 
$
1.72

 
5.7
 
$
474,955

Vested and expected to vest at September 28, 2019
4,503,505

 
$
6.27

 
6.6
 
$
641,908

__________
(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 RSU activity
The following table summarizes the Company’s RSU activity during the nine months ended September 28, 2019:
 
 
Number of Shares
 
Weighted
Average
Grant Date Fair Value Per Share
Unvested at January 1, 2019
 
—

 
$
—

Granted
 
85,222

 
$
169.48

Vested
 
(101
)
 
$
176.04

Unvested at September 28, 2019
 
85,121

 
$
169.49
Schedule of restricted stock activity
The following table summarizes the Company’s restricted stock activity during the nine months ended September 28, 2019:
 
Number
of Shares of
Restricted Stock
 
Weighted
Average
Remaining
Contractual
Life (Years)
 
Weighted
Average
Grant Date
Fair Value
Per Share
Unvested at December 31, 2018
100,127

 
1.6
 
$
17.03

Granted
99,433

 
—
 
$
20.02

Vested/Released
(62,626
)
 
—
 
$
19.21

Cancelled/Forfeited
(23,333
)
 
—
 
$
—

Unvested at September 28, 2019
113,601

 
1.5
 
$
19.49