Stock-Based Compensation (Tables)
|
12 Months Ended |
Dec. 31, 2020 |
Original Stock Option Plan [Member] |
|
Weighted Average Fair Value Assumptions |
The fair value of each stock option to employees granted under the Original Plan was estimated on the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:
|
|
2020 |
|
|
2019 |
|
|
2018 |
|
Expected stock option life |
|
|
— |
|
|
|
— |
|
|
5.15 years |
|
Expected volatility |
|
|
— |
|
|
|
— |
|
|
|
48.82 |
% |
Risk-free interest rate |
|
|
— |
|
|
|
— |
|
|
|
2.35 |
% |
Expected dividend yield |
|
|
— |
|
|
|
— |
|
|
|
- |
% |
|
Schedule of Stock Option Activity |
Stock option activity under the Original Plan
|
|
Stock
Options |
|
|
Weighted-
average
exercise
price |
|
|
Weighted-
average
remaining
contractual
term (years) |
|
|
Aggregate
intrinsic value |
|
Balance December 31, 2019 |
|
|
3,014,004 |
|
|
$ |
3.04 |
|
|
|
5.8 |
|
|
$ |
44,108 |
|
Exercised |
|
|
(1,076,156 |
) |
|
|
1.80 |
|
|
|
|
|
|
|
|
|
Forfeited |
|
|
(81,658 |
) |
|
|
4.59 |
|
|
|
|
|
|
|
|
|
Cancelled |
|
|
(66,440 |
) |
|
|
3.81 |
|
|
|
|
|
|
|
|
|
Balance December 31, 2020 |
|
|
1,789,750 |
|
|
$ |
3.62 |
|
|
|
3.77 |
|
|
$ |
25,077 |
|
Vested and expected to vest, December 31, 2020 |
|
|
1,784,519 |
|
|
$ |
3.61 |
|
|
|
3.76 |
|
|
$ |
25,020 |
|
Vested and exercisable, December 31, 2020 |
|
|
1,731,626 |
|
|
$ |
3.48 |
|
|
|
3.65 |
|
|
$ |
24,449 |
|
|
2018 Equity Incentive Plan [Member] |
|
Weighted Average Fair Value Assumptions |
The fair value of each stock option granted to employees under the 2018 EIP is estimated on the grant date using the Black-Scholes option pricing model with the following weighted average assumptions:
|
|
Assumptions
2020 |
|
|
Assumptions
2019 |
|
|
Assumptions
2018 |
|
Expected stock option life (years) |
|
|
— |
|
|
8.97 years |
|
|
5.79 years |
|
Expected volatility |
|
|
— |
|
|
|
61.33 |
% |
|
|
58.54 |
% |
Risk-free interest rate |
|
|
— |
|
|
|
2.10 |
% |
|
|
2.92 |
% |
Expected dividend yield |
|
|
— |
|
|
-% |
|
|
-% |
|
|
2018 Equity Incentive Plan [Member] | Time-based Stock Options [Member] |
|
Schedule of Stock Option Activity |
Time-based stock option activity
|
|
Stock
Options |
|
|
Weighted-
average
exercise
price |
|
|
Weighted-
average
remaining
contractual
term (years) |
|
|
Aggregate
intrinsic value |
|
Balance December 31, 2019 |
|
|
5,307,130 |
|
|
$ |
14.04 |
|
|
|
8.4 |
|
|
$ |
44,297 |
|
Granted |
|
|
— |
|
|
|
— |
|
|
|
|
|
|
|
|
|
Exercised |
|
|
(703,393 |
) |
|
|
7.76 |
|
|
|
|
|
|
|
|
|
Forfeited |
|
|
(468,096 |
) |
|
|
13.73 |
|
|
|
|
|
|
|
|
|
Cancelled |
|
|
(226,082 |
) |
|
|
13.20 |
|
|
|
|
|
|
|
|
|
Balance December 31, 2020 |
|
|
3,909,559 |
|
|
$ |
15.25 |
|
|
|
7.4 |
|
|
$ |
1,700,194 |
|
Vested and expected to vest, December 31, 2020 |
|
|
3,840,493 |
|
|
$ |
15.10 |
|
|
|
7.4 |
|
|
$ |
1,675,302 |
|
Vested and exercisable, December 31, 2020 |
|
|
3,142,175 |
|
|
$ |
13.16 |
|
|
|
13.2 |
|
|
$ |
1,423,560 |
|
|
2018 Equity Incentive Plan [Member] | Performance-based Stock Options [Member] |
|
Schedule of Stock Option Activity |
Performance-based stock option activity
|
|
Stock
Options |
|
|
Weighted-
average
exercise
price |
|
|
Weighted-
average
remaining
contractual
term (years) |
|
|
Aggregate
intrinsic value |
|
Balance December 31, 2019 |
|
|
520,000 |
|
|
$ |
7.76 |
|
|
|
8.4 |
|
|
$ |
4,872 |
|
Granted |
|
|
— |
|
|
|
— |
|
|
|
|
|
|
|
|
|
Exercised |
|
|
(520,000 |
) |
|
|
7.76 |
|
|
|
|
|
|
|
|
|
Forfeited |
|
|
— |
|
|
|
— |
|
|
|
|
|
|
|
|
|
Cancelled |
|
|
— |
|
|
|
— |
|
|
|
|
|
|
|
|
|
Balance December 31, 2020 |
|
|
— |
|
|
$ |
— |
|
|
|
|
|
|
$ |
— |
|
Vested and expected to vest, December 31, 2020 |
|
|
— |
|
|
$ |
— |
|
|
|
|
|
|
$ |
— |
|
Vested and exercisable, December 31, 2020 |
|
|
— |
|
|
$ |
— |
|
|
|
|
|
|
$ |
— |
|
|
2018 Equity Incentive Plan [Member] | Time-based RSU [Member] |
|
Schedule of RSU Activity |
Time-based RSU activity
|
|
Time-based
RSUs |
|
|
Weighted-average
grant-date
fair value
per share |
|
Non-vested December 31, 2019 |
|
|
1,423,392 |
|
|
$ |
42.05 |
|
Granted |
|
|
2,156,079 |
|
|
|
8.53 |
|
Vested |
|
|
(619,021 |
) |
|
|
35.24 |
|
Forfeited |
|
|
(1,058,349 |
) |
|
|
25.65 |
|
Cancelled |
|
|
(17,711 |
) |
|
|
19.93 |
|
Non-vested December 31, 2020 |
|
|
1,884,390 |
|
|
$ |
15.22 |
|
|
2018 Equity Incentive Plan [Member] | Performance-based RSUs [Member] |
|
Schedule of RSU Activity |
Performance-based RSU activity
|
|
Performance-
based
RSUs |
|
|
Weighted-average
grant-date
fair value
per share |
|
Non-vested December 31, 2019 |
|
|
265,625 |
|
|
$ |
7.76 |
|
Granted |
|
|
493,961 |
|
|
|
7.07 |
|
Vested |
|
|
(218,750 |
) |
|
|
7.76 |
|
Non-vested December 31, 2020 |
|
|
540,836 |
|
|
$ |
7.13 |
|
|