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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