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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2021
Stock-Based Compensation  
Schedule of stock-based compensation expense

    

    

2021

    

2020

    

2019

Secondary market transaction

$

1,933

$

1,616

$

33,232

Employee earnout restricted stock

22,961

Employee awards

 

13,698

 

9,680

 

2,740

Total operating expenses

$

38,592

$

11,296

$

35,972

Schedule of stock option activity

    

    

    

Weighted- 

    

 

 

Weighted- 

 

Average 

 

 

Number of 

 

Average 

 

Remaining 

 

Aggregate 

Options 

 

Exercise 

 

Contractual 

Intrinsic 

Outstanding

Price

 

Life (Years)

Value

Balances as of December 31, 2020

 

6,414,611

$

2.85

 

7.8

 

73,260

Options granted

 

297,343

 

15.10

 

  

 

  

Options exercised

 

(1,700,557)

 

2.56

 

  

 

  

Options forfeited

 

(180,985)

 

5.08

 

  

 

  

Options canceled or expired

 

(7,420)

 

4.30

 

  

 

  

Balances as of December 31, 2021

 

4,822,992

$

3.63

 

7.0

$

57,973

Exercisable at December 31, 2021

 

3,160,534

$

2.87

 

6.5

$

40,205

Schedule of fair value of assumptions

    

2021

    

2020

    

2019

Risk-free interest rate

 

0.9 – 1.3 %

0.3 – 0.6 %

1.6 – 1.9 %

Expected term (years)

 

5 – 6

5 – 6

3 – 6

Dividend yield

 

Volatility

 

60 – 61 %

59 – 60 %

46 – 51 %

Weighted-average grant fair value per share

 

$8.23

$2.26

$0.85

Schedule of restricted stock activity

    

Number of 

Weighted

 

Restricted 

Average

 

Stock Units

Fair Value

Balances as of January 1, 2021

 

2,415,140

$

3.64

Granted

 

2,955,252

18.87

Vested

 

(2,386,853)

4.30

Canceled

(270,777)

11.67

Balances as of December 31, 2021

 

2,712,762

$

18.77

Summary of the activity of restricted stock awards

    

Number of 

 

Restricted 

 

Stock Awards

Balances as of January 1, 2021

 

166,762

Shares granted

 

Shares vested

 

(162,370)

Shares forfeited

 

Balances as of December 31, 2021

 

4,392