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Stock-Based Compensation and Employee Benefit Plan (Tables)
 6 Months Ended
Jun. 30, 2018
Compensation Related Costs [Abstract]  
Employee and Non-Employee Stock-Based Compensation Expense
The following table summarizes the components of employee and non-employee stock-based compensation expense (in thousands):
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
Cost of revenue
 
$
1,971

 
$
1,879

 
$
3,869

 
$
3,637

Research and development
 
1,739

 
1,377

 
3,376

 
2,706

Sales and marketing
 
1,214

 
1,379

 
2,166

 
2,620

General and administrative
 
2,894

 
3,383

 
6,362

 
5,700

Total stock-based compensation
 
$
7,818

 
$
8,018

 
$
15,773

 
$
14,663
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
 
13,878,793

 
—

 
 
 
 
 
 
Granted
 
(423,854
)
 
423,854

 
$
27.95

 
 
 
 
Exercised
 
—

 
(219,724
)
 
$
3.69

 
 
 
 
Cancelled
 
813,078

 
(813,078
)
 
$
9.32

 
 
 
 
Expired
 
(543,306
)
 
—

 
 
 
 
 
 
Balances at June 30, 2018
 
14,762,327

 
14,136,033

 
$
28.11

 
6.16
 
$
31,403

Vested and expected to vest at June 30, 2018
 
 
 
10,917,867

 
$
28.08

 
6.13
 
$
31,402

Exercisable at June 30, 2018
 
 
 
7,483,523

 
$
26.77

 
5.04
 
$
31,349
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
 
41,246

 
30.96

Vested
 
(3,615
)
 
30.96

Forfeited
 
(71,108
)
 
30.94

Unvested Balance at June 30, 2018
 
3,107,101

 
$
30.95