Rendering

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Network
2328301 - Disclosure - Equity Award Plan Activities (Tables)
(http://aristanetworks.com/role/EquityAwardPlanActivitiesTables)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001596532 (http://www.sec.gov/CIK)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
 
Schedule of Option and RSA Activity
The following table summarizes the option activity under our stock plans and related information (in thousands, except years and per share amounts):
 
 
Options Outstanding 
 
 
 
 
 
 
Number of
Shares
Underlying
Outstanding Options
 
Weighted-
Average
Exercise
Price per Share
 
Weighted-
Average
Remaining
Contractual
Term (Years) of
Stock Options
 
Aggregate
Intrinsic
Value
of Stock
Options
Outstanding
Balance—December 31, 2015
 
11,630

 
$
24.49

 
7.6
 
$
620,802

Authorized
 
 
 
 
 
 
 
 
Options granted
 
441

 
56.95

 
 
 
 
Options exercised
 
(2,200
)
 
11.32

 
 
 
 
Options canceled
 
(362
)
 
31.22

 
 
 
 
Balance—December 31, 2016
 
9,509

 
$
28.79

 
6.9
 
$
646,394

Vested and exercisable—December 31, 2016
 
3,642

 
$
15.29

 
6.1
 
$
296,738

Vested and expected to vest—December 31, 2016
 
9,050

 
$
28.23

 
6.9
 
$
620,296


_________________
  
Schedule of Nonvested Restricted Stock Units Activity
A summary of the activity under our 2014 Plan and changes during the reporting period and a summary of information related to RSUs are presented below (in thousands, except years and per share amounts):
 
Number of
Shares
 
Weighted-
Average Grant
Date Fair Value Per Share
 
Weighted-Average
Remaining
Contractual Term (in years)
 
Aggregate Intrinsic Value
Unvested balance—December 31, 2015
893

 
$
70.14

 
1.9
 
$
69,509

       RSUs granted
816

 
76.54

 
 
 
 
       RSUs vested
(244
)
 
69.32

 
 
 
 
       RSUs forfeited/canceled
(90
)
 
67.97

 
 
 
 
Unvested balance—December 31, 2016
1,375

 
$
74.23

 
1.8
 
$
133,081

RSUs vested and expected to vest—December 31, 2016
1,288

 
$
74.14

 
1.7
 
$
124,683

  
Schedule of Shares Available for Grant
The following table presents the stock activity and the total number of shares available for grant as of December 31, 2016 (in thousands):
 
 
Number of Shares
Balance—December 31, 2015
 
10,495

Authorized
 
2,044

Options granted
 
(441
)
RSUs granted
 
(816
)
Options canceled
 
362

Options repurchased
 
5

RSUs forfeited
 
90

Shares traded for taxes
 
15

Balance—December 31, 2016
 
11,754

  
Schedule of Stock-Based Compensation Expense
Total stock-based compensation expense related to options, RSAs, ESPP and RSUs granted were charged to the department to which the associated employee reported as follow (in thousands):
 
Year Ended December 31,
 
2016
 
2015
 
2014
Cost of revenue
$
3,620

 
$
3,048

 
$
1,535

Research and development
31,892

 
25,515

 
14,986

Sales and marketing   
15,666

 
11,454

 
7,643

General and administrative
7,854

 
5,286

 
3,455

           Total stock-based compensation
$
59,032

 
$
45,303

 
$
27,619


  
Schedule of Stock Option Valuation Assumptions
For the years ended December 31, 2016, 2015 and 2014 the fair value of each stock option granted under our plans was estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions and fair value per share:  
 
Year Ended December 31,
 
2016
 
2015
 
2014
Expected term (in years)
6.7

 
6.2

 
7.6

Risk-free interest rate
1.5
%
 
1.6
%
 
2.2
%
Expected volatility
38.9
%
 
42.9
%
 
47.7
%
Dividend rate
—
%
 
—
%
 
—
%
  
Schedule of ESPP Valuation Assumptions
The following table summarizes the assumptions relating to our ESPP:
 
Year Ended December 31,
 
2016
 
2015
 
2014
Expected term (in years)
1.2

 
1.4

 
1.4

Risk-free interest rate
0.6
%
 
0.3
%
 
0.3
%
Expected volatility
31.8
%
 
34.8
%
 
36.3
%
Dividend rate
—
%
 
—

 
—