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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Summary of RSU Activity

 

 

 

Number
of RSUs and Restricted Stock

 

 

Weighted-Average
Grant Date
Fair Value

 

Outstanding as of December 31, 2020

 

 

4,061

 

 

$

8.31

 

Granted

 

 

1,554

 

 

 

15.02

 

Vested and delivered

 

 

(1,493

)

 

 

8.36

 

Forfeited

 

 

(201

)

 

 

9.13

 

Outstanding as of June 30, 2021 (1)

 

 

3,921

 

 

 

10.91

 

 

(1)
Included in “Outstanding as of June 30, 2021” are 64 RSUs that were vested, but not yet delivered.
Summary of PSU Activity PSU activity for the six months ended June 30, 2021 is as follows (in thousands, except for weighted-average grant date fair value):

 

 

 

Number
of PSUs

 

 

Weighted-Average
Grant Date
Fair Value

 

Outstanding as of December 31, 2020

 

 

730

 

 

$

9.28

 

Granted

 

 

 

 

 

 

Vested and delivered

 

 

(588

)

 

 

5.74

 

Forfeited

 

 

 

 

 

 

Outstanding as of June 30, 2021

 

 

142

 

 

 

23.98

 

Summary of Stock Option Activity Stock option activity for the six months ended June 30, 2021 is as follows (in thousands, except for weighted-average grant date fair value and weighted-average remaining contractual term):

 

 

 

Number of Options

 

 

Weighted-Average
Grant Date
Fair Value

 

 

Weighted-Average Remaining Contractual Term (in years)

 

 

Aggregate Intrinsic Value

 

Outstanding as of December 31, 2020

 

 

513

 

 

$

2.80

 

 

 

9.22

 

 

$

3,028

 

Granted

 

 

291

 

 

 

9.63

 

 

 

 

 

 

 

Exercised

 

 

 

 

 

 

 

 

 

 

 

 

Forfeited

 

 

 

 

 

 

 

 

 

 

 

 

Outstanding as of June 30, 2021

 

 

804

 

 

 

5.27

 

 

 

9.08

 

 

 

4,583

 

Exercisable as of June 30, 2021

 

 

 

 

 

 

 

 

 

 

 

 

Summary of Fair Value of Stock Options Granted are Estimated Using Black Scholes Option Pricing Model

The fair value of the stock options granted during the six months ended June 30, 2021 and 2020 are estimated on the grant date using the Black-Scholes option pricing model, using the following assumptions:

 

 

2021

 

 

2020

 

Risk-free interest rate

 

1.15

%

 

 

1.01

%

Weighted-average volatility

 

69.00

%

 

 

53.08

%

Dividend yield

 

0

%

 

 

0

%

Expected years until exercise

 

6.5

 

 

 

6.5