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Stock Incentive Plan and Stock-based Compensation (Tables)
9 Months Ended
Sep. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Summary of Changes in Stock Options Granted

The following table summarizes stock option activity for the nine months ended September 30, 2021:

    

    

    

Weighted-

Weighted-

Average

Average

Remaining

Number of

Exercise

Contractual

    

Awards

    

Price

    

Term

Awards outstanding—December 31, 2020

 

5,210,832

$

17.66

 

8.63

Awards issued

 

1,391,803

$

35.02

 

  

Awards exercised

 

(268,569)

$

8.29

 

  

Awards forfeited

 

(357,617)

$

23.66

 

  

Awards outstanding—September 30, 2021

 

5,976,449

$

21.76

 

8.28

Summary of Changes in SARs Granted

The following table summarizes SARs activity for the nine months ended September 30, 2021:

    

    

    

Weighted-

Weighted-

Average

Average

Remaining

Number of

Exercise

Contractual

    

Awards

    

Price

    

Term

Awards outstanding—December 31, 2020

 

49,294

$

9.24

 

8.29

Awards issued

 

$

 

  

Awards exercised

 

$

 

  

Awards forfeited

 

$

 

  

Awards outstanding—September 30, 2021

 

49,294

$

9.24

 

7.54

Summary of Changes in RSUs Granted

The following table summarizes RSU activity for the nine months ended September 30, 2021:

    

    

    

Weighted-

Weighted-

Average

Average

Remaining

Number of

Exercise

Contractual

    

Awards

    

Price

    

Term

Awards outstanding—December 31, 2020

 

$

 

Awards issued

 

60,000

$

29.03

 

  

Awards exercised

 

$

 

  

Awards forfeited

 

$

 

  

Awards outstanding—September 30, 2021

 

60,000

$

29.03

 

9.49

Summary of Assumptions Used to Value Awards

The assumptions used to value the awards are summarized in the following table.

As of

 

    

September 30, 

    

December 31, 

 

    

2021

    

2020

 

Dividend yield

 

0.00

%  

0.00

%

Expected volatility

 

60.00

%  

55.00 - 95.80

%

Risk-free interest rate

 

0.66 - 1.19

%  

0.32 - 0.56

%

Lack of marketability discount

 

0.00

%  

0.00 - 20.48

%

Expected term (years)

 

4.6 - 6.3

 

5.4 - 6.5

Summary of Stock-based Compensation Expense

Stock-Based Compensation

Stock-based compensation expense, net for the three and nine months ended September 30, 2021 and 2020, respectively, was recorded in the unaudited condensed consolidated statements of operations and comprehensive income (loss) in the following line items:

    

Three Months Ended September 30, 

Nine Months Ended September 30, 

    

2021

    

2020

    

2021

    

2020

Research and development expense

$

579

$

141

$

1,548

$

310

Sales and marketing expense

 

852

 

159

 

2,248

 

378

General and administrative expense

 

3,233

 

1,030

 

7,926

 

1,578

$

4,664

$

1,330

$

11,722

$

2,266