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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Weighted Average Assumptions of Fair Value Options Using Black-Scholes Option-Pricing Model The fair value of each option grant is estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted average assumptions for the years ended December 31, 2019, 2018 and 2017:
 
December 31,
 
2019
 
2018
 
2017
Dividend yield
—%
 
—%
 
—%
Risk-free interest rate
1.66% – 3.05%
 
2.5% – 3.1%
 
1.7% – 2.1%
Expected life (in years)
5.0
 
5.0
 
5.0
Historical volatility
43.42% – 44%
 
43.5% – 48.4%
 
46.6% – 48.1%
Schedule of Stock Option Activity and Weighted Average Exercise Prices
A summary of the Company’s stock option activity and weighted average exercise prices follows:
 
Stock Option Activity
 
Weighted Average Remaining Contractual Term (in years)
 
Aggregate Intrinsic Value (in thousands)
 
Options (in thousands)
 
Weighted
Average
Exercise Price
 
 
Balance outstanding at December 31, 2016
7,769

 
$
10.88

 
 
 
 
Granted
2,042

 
9.87

 
 
 
 
Exercised
(854
)
 
8.80

 
 
 
 
Cancelled or expired
(998
)
 
11.98

 
 
 
 
Balance outstanding at December 31, 2017
7,959

 
$
10.71

 
5.85
 
$
14,881

Options vested and expected to vest
7,163

 
$
10.75

 
5.49
 
$
13,197

Options exercisable at December 31, 2017
5,163

 
$
11.17

 
4.50
 
$
8,648

 
 
 
 
 
 
 
 
Balance outstanding at December 31, 2017
7,959

 
$
10.71

 
 
 
 
Granted
2,033

 
15.00

 
 
 
 
Exercised
(3,120
)
 
10.70

 
 
 
 
Cancelled or expired
(606
)
 
10.03

 
 
 
 
Balance outstanding at December 31, 2018
6,266

 
$
12.13

 
6.55
 
$
43,348

Options vested and expected to vest
5,550

 
$
11.89

 
6.28
 
$
39,521

Options exercisable at December 31, 2018
3,278

 
$
11.12

 
4.64
 
$
25,367

 
 
 
 
 
 
 
 
Balance outstanding at December 31, 2018
6,266

 
$
12.13

 
 
 
 
Granted
1,425

 
29.76

 
 
 
 
Exercised
(1,523
)
 
11.12

 
 
 
 
Cancelled or expired
(369
)
 
14.76

 
 
 
 
Balance outstanding at December 31, 2019
5,799

 
$
16.57

 
6.79
 
$
119,064

Options vested and expected to vest
5,096

 
$
15.29

 
6.49
 
$
110,934

Options exercisable at December 31, 2019
2,901

 
$
12.03

 
4.95
 
$
72,424
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range
The following table summarizes information about outstanding and vested stock options as of December 31, 2019:
 
 
Options Outstanding
 
Options Exercisable
Range of Exercise Prices
 
Number of Shares Outstanding (in thousands)
 
Weighted-Average Remaining Contractual Life (Years)
 
Weighted-Average Exercise Price
 
Number of Shares (in thousands)
 
Weighted-Average Exercise Price
$6.23 - $7.6
 
643

 
6.37
 
$
7.42

 
392

 
$
7.40

$7.95 - $10.05
 
648

 
4.83
 
9.47

 
604

 
9.48

$10.13 - $11.95
 
621

 
5.93
 
10.85

 
476

 
10.53

$11.96 - $12.32
 
50

 
1.51
 
12.10

 
50

 
12.10

$12.45 - $12.45
 
782

 
7.91
 
12.45

 
287

 
12.45

$12.46 - $14.3
 
758

 
3.62
 
13.57

 
628

 
13.41

$14.5 - $17.88
 
580

 
6.44
 
16.11

 
271

 
16.60

$18.09 - $28.18
 
803

 
8.89
 
24.15

 
193

 
21.55

$28.23 - $32.37
 
756

 
9.38
 
29.93

 
—

 
—

$40.61 - $40.61
 
158

 
9.47
 
40.61

 
—

 
—

 
 
 
 
 
 
 
 
 
 
 
 
 
5,799

 
6.79
 
$
16.57

 
2,901

 
$
12.03
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
Restricted Stock Unit Activity
A summary of the Company’s restricted stock units (“RSUs”) activity and weighted average exercise prices follows:
 
Restricted Stock Unit Activity
 
 
 
Number of Shares (in thousands)
 
Weighted Average
Grant Date Fair Value (Per Share)
 
Aggregate Fair Value (in thousands)
Balance outstanding at December 31, 2016
1,188

 
$
8.44

 
$
8,968

Awarded
332

 
8.16

 
—

Released
(363
)
 
8.48

 
—

Forfeited
(284
)
 
8.46

 
—

Non-vested and outstanding at December 31, 2017
873

 
$
8.29

 
$
10,053

 
 
 
 
 
 
Balance outstanding at December 31, 2017
873

 
$
8.29

 
$
10,053

Awarded
2,568

 
17.02

 
—

Released
(361
)
 
9.49

 
—

Forfeited
(390
)
 
9.49

 
—

Non-vested and outstanding at December 31, 2018
2,690

 
$
15.81

 
$
50,756

 
 
 
 
 
 
Balance outstanding at December 31, 2018
2,690

 
$
15.81

 
$
50,756

Awarded
1,979

 
30.99

 
—

Released
(1,197
)
 
14.24

 
—

Forfeited
(423
)
 
20.28

 
—

Non-vested and outstanding at December 31, 2019
3,049

 
$
24.73

 
$
112,848

Expected to vest
2,059

 
$
22.97

 
$
76,185