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Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Stock-based compensation expense
Total compensation expense by award type and line item in our consolidated financial statements was as follows (in thousands):
 
For the Years Ended December 31,
  
2019
 
2018
 
2017
Award Type
 
 
 
 
 
Stock options
$
4,237

 
$
9,008

 
$
15,487

Performance-based stock options
448

 
447

 
447

RSUs
8,877

 
7,766

 
4,503

Performance-based RSUs
(388
)
 
388

 
—

LSUs
2,444

 
—

 
—

Total compensation expense by award type
$
15,618

 
$
17,609

 
$
20,437

 
 
 
 
 
 
Line Item
 
 
 
 
 
Cost of revenue
$
2,673

 
$
1,475

 
$
1,371

Selling, general and administrative expenses
12,945

 
16,134

 
19,066

Total compensation expense by financial statement line item
$
15,618

 
$
17,609

 
$
20,437
Schedule of unrecognized compensation expense
Total unrecognized compensation expense (in thousands) and expected weighted-average period (in years) by award type for all of our stock-based incentive plans were as follows:

 
As of December 31, 2019
 
Unrecognized Compensation Expense
 
Weighted Average Period
Stock options
$
5,829

 
2.22
Performance-based stock options
75

 
0.17
RSUs
12,767

 
2.58
LSUs
6,356

 
2.17
Total
$
25,027

 
 
Option price assumptions
The option price assumptions used for our stock option awards were as follows:

 
For the Years Ended December 31,
 
2019
 
2018
 
2017
Weighted-average fair value per option granted
$
6.52

 
$
6.30

 
$
8.38

Assumptions:
 
 
 
 
 
Expected term (in years)
6.25

 
6.25

 
6.25

Expected volatility
51.6
%
 
38.9
%
 
42.8
%
Risk-free interest rate
1.9- 2.7%

 
2.6 - 2.9%

 
1.9 - 2.1%

Dividend yield
—
%
 
—
%
 
—
%
Stock option information
Information with respect to our stock options (in thousands), including weighted-average remaining contractual term (in years) and aggregate intrinsic value (in thousands) was as follows:

 
Options
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Term
 
Aggregate Intrinsic Value
Outstanding as of December 31, 2018
5,089

 
$
9.82

 
6.86
 
$
51,556

Granted
437

 
12.48

 
 
 
 
Exercised
(138
)
 
7.91

 
 
 
 
Forfeited
(560
)
 
15.63

 
 
 
 
Outstanding as of December 31, 2019
4,828

 
$
9.44

 
6.01
 
$
(1,880
)
 
 
 
 
 
 
 
 
Vested and expected to vest after December 31, 2019
4,553

 
$
9.16

 
5.91
 
$
(488
)
 
 
 
 
 
 
 
 
Exercisable at December 31, 2019
3,453

 
$
7.58

 
5.23
 
$
5,082
Performance-based stock option awards activity
Information with respect to our performance-based stock options (shares and aggregate intrinsic value shown in thousands, weighted-average remaining contractual term shown in years) was as follows:

 
Options
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Term
 
Aggregate Intrinsic Value
Outstanding as of December 31, 2018
268

 
$
10.27

 
7.17
 
$
2,592

Outstanding as of December 31, 2019
268

 
10.27

 
6.17
 
(326
)
 
 
 
 
 
 
 
 
Vested and expected to vest after December 31, 2019
268

 
$
10.27

 
6.17
 
$
(326
)
Restricted stock units information Information with respect to our RSUs is presented below (in thousands, except for weighted-average grant-date fair value):

 
Total RSUs
 
Weighted Average Grant Date Fair Value
Outstanding as of December 31, 2018
1,391

 
$
16.01

Granted
976

 
10.66

Forfeited
(337
)
 
14.81

Vested
(537
)
 
17.54

Outstanding as of December 31, 2019
1,493

 
$
12.23
Leveraged stock units activity
Information with respect to our leveraged stock unit awards (shares and aggregate intrinsic value shown in thousands, weighted-average remaining contractual term shown in years) was as follows:
 
Leveraged Stock Units
 
Weighted Average Grant Date Fair Value
 
Weighted Average Remaining Contractual Term
 
Aggregate Intrinsic Value
Outstanding as of December 31, 2019
685

 
$
12.85

 
9.17
 
$
(2,603
)
 
 
 
 
 
 
 
 
Vested and expected to vest after December 31, 2019
685

 
$
12.85

 
9.17
 
$
(2,603
)