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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Fair Values of Stock Options Granted and Assumptions used in Black-Scholes Model

The estimated fair values of stock options granted, and the assumptions used for the Black-Scholes option pricing model were as follows:

 

 

 

 

Year ended December 31,

 

 

 

2020

 

 

2019

 

 

2018

 

Estimated fair values of stock options granted

 

$

3.24

 

 

$

10.18

 

 

$

9.09

 

Assumptions:

 

 

 

 

 

 

 

 

 

 

 

 

Risk-free interest rate

 

.3% - 1.7%

 

 

1.7% - 2.5%

 

 

2.2% - 3.0%

 

Expected volatility

 

77.4% - 81.2%

 

 

52.6% - 78.9%

 

 

40.9% - 57.2%

 

Expected term (in years)

 

6.0 - 10

 

 

6.8 - 10

 

 

5.6 - 10

 

Summary of Stock Option Activity

Information on stock option activity is as follows:

 

 

 

 

 

Options

Exercisable

 

 

Weighted-

Average

Exercise

Price Per

Share

 

 

Options

Outstanding

 

 

Weighted-

Average

Exercise

Price Per

Share

 

Balance as of December 31, 2019

 

 

1,789,567

 

 

$

8.73

 

 

 

4,481,359

 

 

$

11.73

 

Granted

 

 

 

 

 

 

 

 

 

 

887,765

 

 

 

4.67

 

Exercised

 

 

 

 

 

 

 

 

 

 

(58,575

)

 

 

3.60

 

Forfeited or expired

 

 

 

 

 

 

 

 

 

 

(689,376

)

 

 

12.89

 

Balance as of December 31, 2020

 

 

2,347,665

 

 

$

10.15

 

 

 

4,621,173

 

 

$

10.30

 

Schedule of Net Cash Proceeds from Exercise of Stock Options Less Shares Used for Minimum Withholding Taxes and Intrinsic Value of Options Exercised

Net cash proceeds from the exercise of stock options less shares used for minimum withholding taxes and the intrinsic value of options exercised were as follows:

 

 

 

 

Year ended December 31,

 

In Thousands

 

2020

 

 

2019

 

 

2018

 

Net cash proceeds

 

$

212

 

 

$

344

 

 

$

2,622

 

Intrinsic value of options exercised

 

$

179

 

 

$

905

 

 

$

7,569

 

Summary of Activity of Restricted Stock Units

Information on restricted stock unit activity follows:

 

 

 

 

Number of

Restricted Stock

Units Outstanding

 

 

Weighted-

Average

Grant Date Fair

Value

 

Unvested balance at December 31, 2019

 

 

813,526

 

 

$

10.31

 

Granted

 

 

105,633

 

 

 

6.54

 

Vested

 

 

(309,693

)

 

 

10.08

 

Cancelled

 

 

(61,659

)

 

 

10.80

 

Unvested balance at December 31, 2020

 

 

547,807

 

 

$

9.49

 

Summary of Grant Date Fair Value of Restricted Stock Unit Awards Vested

The total grant-date fair value of restricted stock unit awards that vested was as follows:

 

 

 

 

Year ended December 31,

 

In Thousands

 

2020

 

 

2019

 

 

2018

 

Grant-date fair value

 

$

3,122

 

 

$

3,141

 

 

$

2,691

 

Schedule of Weighted Average Grant Date Fair Value of Restricted Stock Units Issued

Information on the weighted average grant date fair value of restricted stock units issued was as follows:

 

 

 

Year ended December 31,

 

In Thousands

 

2020

 

 

2019

 

 

2018

 

Weighted average grant date fair value

 

$

6.54

 

 

$

12.48

 

 

$

16.76

 

Summary of Stock-Based Compensation Granted As Deemed Dividends

We treat stock-based compensation awards granted to employees of Cellectis as deemed dividends. We recorded deemed dividends for restricted stock units as follows:

 

 

 

 

Year ended December 31,

 

In Thousands

 

2020

 

 

2019

 

 

2018

 

Deemed dividends from grants to Cellectis employees

 

$

1,168

 

 

$

1,358

 

 

$

2,253

 

Summary of Fair Values of Performance Stock Units Granted and Assumptions used in Monte Carlo Simulation Pricing Model

The estimated fair values of performance stock units granted, and the assumptions used for the Monte Carlo simulation pricing model were as follows:

 

 

Estimated fair values of performance stock units granted

 

$

7.06

 

Assumptions:

 

 

 

 

Risk-free interest rate

 

 

1.71

%

Expected volatility

 

 

75.0

%

Expected term (in years)

 

3.0

 

Stock Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Stock-based Compensation Expense

Stock-based compensation expense related to stock option awards was as follows:

 

 

 

 

Year ended December 31,

 

In Thousands

 

2020

 

 

2019

 

 

2018

 

Stock-based compensation expenses

 

$

3,371

 

 

$

6,035

 

 

$

3,609

 

Restricted Stock Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Stock-based Compensation Expense

Stock-based compensation expense related to restricted stock units was as follows:

 

 

 

 

Year ended December 31,

 

In Thousands

 

2020

 

 

2019

 

 

2018

 

Stock-based compensation expenses

 

$

1,155

 

 

$

2,910

 

 

$

776

 

Performance Stock Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Stock-based Compensation Expense

 

 

 

Year ended December 31,

In Thousands

 

2020

 

 

2019

 

 

Stock-based compensation expenses

 

$

445

 

 

$

225