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Stock-Based Compensation and Employee Benefit Plan (Tables)
 9 Months Ended
Sep. 30, 2018
Compensation Related Costs [Abstract]  
Employee and Non-Employee Stock-Based Compensation Expense
The following table summarizes the components of stock-based compensation expense (in thousands):
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
 
Cost of revenue
 
$
16,156

 
$
1,906

 
$
20,025

 
$
5,543

Research and development
 
15,127

 
1,354

 
18,504

 
4,060

Sales and marketing
 
12,900

 
1,002

 
15,066

 
3,622

General and administrative
 
27,494

 
3,424

 
33,856

 
9,124

 
 
$
71,677

 
$
7,686

 
$
87,451

 
$
22,349
Stock Option and RSU Activity
Stock option and RSU activity is as follows:
 
 
 
 
Outstanding Options/RSUs
 
 
 
 
Options/
RSUs
Available
for Grant
 
Number of
Shares
 
Outstanding
Options
Weighted
Average
Exercise
Price
 
Remaining
Contractual
Life (Years)
 
Aggregate
Intrinsic
Value
 
 
 
 
 
 
 
 
 
 
(in thousands)
Balances at December 31, 2016
 
2,768,450

 
13,171,196

 
$
23.85

 
6.11
 
$
74,717

Added to plan
 
647,159

 
—

 
 
 
 
 
 
Granted
 
(2,698,594
)
 
2,698,594

 
$
30.96

 
 
 
 
Exercised
 
—

 
(157,049
)
 
$
2.76

 
 
 
 
Cancelled
 
967,760

 
(967,760
)
 
$
7.44

 
 
 
 
Expired
 
(647,159
)
 
—

 
 
 
 
 
 
Balances at December 31, 2017
 
1,037,616

 
14,744,981

 
$
26.42

 
6.19
 
$
52,703

Added to plan
 
40,782,196

 
—

 
 
 
 
 
 
Granted
 
(16,853,050
)
 
16,853,050

 
$
16.24

 
 
 
 
Exercised
 
—

 
(395,611
)
 
$
4.03

 
 
 
 
Cancelled
 
916,572

 
(916,572
)
 
$
9.96

 
 
 
 
Expired
 
(7,348,257
)
 
—

 
 
 
 
 
 
Balances at September 30, 2018
 
18,535,077

 
30,285,848

 
$
25.88

 
6.75
 
$
110,750

Vested and expected to vest at September 30, 2018
 
 
 
13,038,789

 
$
26.07

 
6.67
 
$
104,482

Exercisable at September 30, 2018
 
 
 
7,858,582

 
$
27.51

 
5.15
 
$
51,608
RSU Activity and Related Information
A summary of the Company’s RSU activity and related information is as follows:
 
 
Number of
Awards
Outstanding
 
Weighted
Average Grant
Date Fair
Value
 
 
 
 
 
Unvested Balance at December 31, 2016
 
2,666,446

 
$
30.95

Granted
 
552,481

 
30.96

Vested
 
(33,896
)
 
30.96

Forfeited
 
(44,453
)
 
30.95

Unvested Balance at December 31, 2017
 
3,140,578

 
30.95

Granted
 
13,788,433

 
15.98

Vested
 
(17,793
)
 
19.67

Forfeited
 
(124,649
)
 
25.13

Unvested Balance at September 30, 2018
 
16,786,569

 
$
18.71