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SHARE INCENTIVE PLANS (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Summary of share option awards activity under equity incentive plans
The following table summarizes the share option activity under all equity incentive plans:
 
Options Outstanding
 
Number
of Shares
 
Weighted Average Exercise Price
Outstanding at December 31, 2017
1,110,061

 
$
38.35

Options exercised
(586,076
)
 
$
24.77

Options canceled
(29,482
)
 
$
100.81

Outstanding at December 31, 2018
494,503

 
$
50.73

Options exercised
(219,458
)
 
$
34.63

Options canceled
(1,040
)
 
$
91.91

Outstanding at December 31, 2019
274,005

 
$
63.46
Summary of restricted share units activity
The following table summarizes the restricted share unit activity under all equity incentive plans:
 
Restricted Share
Units Outstanding
 
Number of
Shares
 
Weighted Average Grant Date Fair Value
Non-vested restricted share units at December 31, 2017
3,414,705

 
$
48.45

Restricted share units granted
1,773,217

 
$
80.40

Restricted share units vested
(1,354,359
)
 
$
48.35

Restricted share units canceled
(539,400
)
 
$
52.29

Non-vested restricted share units at December 31, 2018
3,294,163

 
$
65.05

Restricted share units granted
1,581,524

 
$
105.42

Restricted share units vested
(1,316,316
)
 
$
60.63

Restricted share units canceled
(244,023
)
 
$
73.76

Non-vested restricted share units at December 31, 2019
3,315,348

 
$
85.43
Summary of ordinary shares reserved for future issuance under equity incentive plans
The Company had the following ordinary shares reserved for future issuance under its equity incentive plans as of December 31, 2019:
 
Number of
Shares
Share options outstanding
274,005

Restricted share units outstanding
3,315,348

Shares authorized for future issuance
2,253,990

ESPP shares available for future issuance
2,625,623

Total shares reserved for future issuance as of December 31, 2019
8,468,966
Schedule of weighted average assumptions used to value share options granted The following weighted average assumptions were used in the valuation of the ESPP for the years ended December 31, 2019, 2018 and 2017:
 
 
Employee Share Purchase Plan
 
 
Year ended December 31,
 
 
2019
 
2018
 
2017
Dividend yield, %
 
—

 
—

 
—

Expected volatility
 
27.1
%
 
31.0
%
 
24.6
%
Risk free interest rate
 
2.14
%
 
1.78
%
 
1.20
%
Expected life, years
 
0.50

 
0.50

 
0.50
Summary of the distribution of total share-based compensation expense
The following table summarizes the distribution of total share-based compensation expense in the Consolidated Statements of Operations:
 
Year ended December 31,
 
2019
 
2018
 
2017
 
(in thousands)
Share-based compensation expense by caption:
 

 
 

 
 

Cost of goods sold
$
3,493

 
$
1,950

 
$
2,000

Research and development
61,315

 
38,922

 
40,278

Sales and marketing
26,614

 
17,042

 
15,693

General and administrative
20,696

 
13,428

 
10,893

Total share-based compensation expense
$
112,118

 
$
71,342

 
$
68,864

 
 
 
 
 
 
Share-based compensation expense by type of award:
 

 
 

 
 

Share options
$
8

 
$
12

 
$
115

ESPP
7,161

 
6,378

 
6,232

RSU
102,898

 
64,059

 
62,517

PSU
2,051

 
893

 
—

Total share-based compensation expense
$
112,118

 
$
71,342

 
$
68,864