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Equity (Tables)
6 Months Ended
Jun. 30, 2021
Schedule of Assumptions Used to Determine Fair Value of Stock Options Granted

The fair value of the stock options granted during the six months ended June 30, 2021 and 2020 was determined using the Black-Scholes option pricing model with the following assumptions:

 

 

June 30,

2021

 

 

June 30,

2020

Expected volatility

75.9-78.0%

 

 

70.3-74.7%

Expected term (years)

5.5-7.0

 

 

5.5-7.0

Risk free interest rate

0.5%-1.2%

 

 

0.3%-1.6%

Expected dividend yield

 

0

%

 

0%

Exercise price

$66.82-$82.21

 

 

$31.95-$50.00

Summary of Stock Option Activity

The following table provides a summary of the stock option activity under the 2018 Plan during the six months ended June 30, 2021. These amounts include stock options granted to employees, directors and consultants.

 

Stock options

 

Options

 

 

Weighted Average

Exercise Price

 

 

Weighted Average

Remaining Contractual Term (Years)

 

 

Aggregate Intrinsic Value

 

Outstanding at December 31, 2020

 

 

4,321,882

 

 

$

26.35

 

 

 

 

 

 

 

 

 

Granted

 

 

1,491,974

 

 

$

77.53

 

 

 

 

 

 

 

 

 

Exercised

 

 

(361,706

)

 

$

21.41

 

 

 

 

 

 

 

 

 

Forfeited

 

 

(19,225

)

 

$

50.50

 

 

 

 

 

 

 

 

 

Outstanding at June 30, 2021

 

 

5,432,925

 

 

$

40.65

 

 

 

8.40

 

 

$

199,393,804

 

Exercisable at June 30, 2021

 

 

2,172,181

 

 

$

22.78

 

 

 

7.69

 

 

$

117,772,016

 

Summary of Restricted Stock Grant Activity

The following table provides a summary of the restricted stock grant activity under the Incentive Plan during the six months ended June 30, 2021. These amounts include restricted stock granted to employees, directors and consultants.

Restricted shares

 

Shares

 

 

Weighted Average

Grant Date

Fair Value Per

Share

 

Unvested restricted stock at December 31, 2020

 

 

238,712

 

 

$

16.00

 

Vested

 

 

(125,028

)

 

$

16.00

 

Unvested restricted stock at June 30, 2021

 

 

113,684

 

 

$

16.00

 

Restricted Stock Units  
Summary of Restricted Stock Grant Activity

The following table provides a summary of the restricted stock unit activity under the 2018 Plan during the six months ended June 30, 2021. These amounts include restricted stock units granted to employees.

 

Restricted stock units

 

Shares

 

 

Weighted Average

Grant Date

Fair Value Per

Share

 

Unvested restricted stock units at December 31, 2020

 

 

133,049

 

 

$

20.01

 

Vested

 

 

(40,344

)

 

$

19.36

 

Cancelled

 

 

(387

)

 

$

19.36

 

Unvested restricted stock units at June 30, 2021

 

 

92,318

 

 

$

20.30