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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2021
Stock-Based Compensation  
Schedule of stock option activity

Stock option activity under the 2018 Plan is as follows:

Weighted-

Average

Weighted-

Remaining

Aggregate

Average

Contractual

Intrinsic

Number of

Exercise

Term

Value

    

Options

    

Price

    

(years)

    

(in thousands)

Balance – December 31, 2020

 

2,594,597

$

3.79

 

8.5

$

13,791

Granted(1)

 

965,944

 

10.52

 

 

Exercised

Forfeited

 

 

 

 

Cancelled

 

 

 

 

Balance – June 30, 2021

 

3,560,541

$

5.61

 

8.2

$

118,483

Exercisable – June 30, 2021

 

2,594,597

$

3.79

 

7.6

$

91,080

Vested and expected to vest – June 30, 2021

3,560,541

$

5.61

8.2

$

118,483

(1)The options granted during the period were not included in the number of options for which vesting was accelerated as part of the Business Combination.
Schedule of restricted stock unit activity

Restricted stock unit activity under the 2018 Plan is as follows:

Weighted- 

Average 

Grant Date 

Number of 

Fair Value 

    

Awards

    

per Share

Unvested and outstanding balance at December 31, 2020

 

313,976

$

4.30

Granted

 

 

Vested

 

(313,976)

 

4.30

Forfeited

 

 

Unvested and outstanding balance at June 30, 2021

 

$

Schedule of assumptions used to determine fair value of options granted

We estimated the fair value of each option on the date of grant using the Black-Scholes option pricing model applying the weighted-average assumptions in the following table. There were no options granted during the three months ended June 30, 2021 and 2020.

Six Months Ended June 30,

    

2021

    

2020

Fair value of common stock

$

10.52

$

3.94 – $4.17

Expected term, in years

 

5.86

 

5.88 – 6.06

Expected volatility

 

47%

 

40%

Risk-free interest rate

 

0.57%

 

1.45% – 1.46%

Expected dividend yield

 

0%

 

0%

Schedule of allocated share-based compensation expense

Stock-based compensation expense under our equity incentive plans was as follows (in thousands):

Three Months Ended June 30,

Six Months Ended June 30,

    

2021

    

2020

    

2021

2020

Cost of sales

$

$

5

$

$

10

Selling and administrative expenses

 

361

 

1,340

3,859

2,084

Total

$

361

$

1,345

$

3,859

$

2,094