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Equity-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of Stock Options apply the following assumptions in our Black-Scholes-Merton Model option-pricing formula:
 
Year Ended
December 31,
2019
 
Year Ended
December 31,
2018
 
Year Ended
December 31,
2017
Expected term (in years)
3.0 - 10.0
 
3.0 - 10.0
 
3.0 - 10.0
Risk-free interest rate
1.35% - 2.63%
 
2.32% - 3.09%
 
1.32% - 2.41%
Expected volatility
54% - 63%
 
40% - 54%
 
38% - 55%
Expected dividend yield
0%
 
0%
 
0%
Summary of Option Activity Under Stock Plans
A summary of option activity under our stock option plans as of December 31, 2019, and the changes during the year is presented below: 
Options
Number of
options
 
Weighted
average
exercise
price
 
Weighted
average
remaining
contractual
term (years)
 
Aggregate
intrinsic value
(in thousands)
Outstanding at December 31, 2018
33,031,298

 
$
9.31

 
5.93
 
$
232

Granted
8,066,000

 
$
2.47

 
 
 
 
Exercised
(24,877
)
 
$
0.66

 
 
 
 
Forfeited
(1,443,575
)
 
$
7.32

 
 
 
 
Expired
(2,258,425
)
 
$
7.74

 
 
 
 
Outstanding at December 31, 2019
37,370,421

 
$
8.01

 
6.00
 
$
—

Vested and expected to vest at December 31, 2019
37,370,421

 
$
8.01

 
6.00
 
$
—

Exercisable at December 31, 2019
24,448,521

 
$
10.18

 
4.49
 
$
—