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Stock-Based Compensation (Tables) | 12 Months Ended
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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 |  |

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