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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2021
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:
| Three Months Ended March 31, |
| 2021 |  |  | 2020 |
Estimated fair values of stock options granted | $ | 5.85 |  |  | $ | 5.19 |
Assumptions: |  |  |  |  |  |  |
Risk-free interest rate |  | 0.6 | % |  |  | 1.7 | %
Expected volatility |  | 85.0 | % |  |  | 77.4 | %
Expected term (in years) | 5.7 - 6.2 |  |  |  | 6.9 |
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, 2020 |  | 2,347,663 |  |  | $ | 10.15 |  |  |  | 4,621,173 |  |  | $ | 10.30 |
Granted |  |  |  |  |  |  |  |  |  | 270,800 |  |  |  | 8.07 |
Exercised |  |  |  |  |  |  |  |  |  | (56,372 | ) |  |  | 3.71 |
Forfeited or expired |  |  |  |  |  |  |  |  |  | (456,450 | ) |  |  | 10.03 |
Balance as of March 31, 2021 |  | 2,369,997 |  |  | $ | 10.38 |  |  |  | 4,379,151 |  |  | $ | 10.27 |
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:
| Three Months Ended March 31, |
In Thousands | 2021 |  |  | 2020 |
Net cash proceeds | $ | 208 |  |  | $ | — |
Intrinsic value of options exercised | $ | 331 |  |  | $ | — |
Summary of Activity of Restricted Stock Units | Information on restricted stock unit activity is as follows:
| Number of Restricted Stock Units Outstanding |  |  | Weighted- Average Grant Date Fair Value |
Unvested balance at December 31, 2020 |  | 547,807 |  |  | $ | 9.49 |
Granted |  | 68,000 |  |  |  | 8.05 |
Vested |  | (27,386 | ) |  |  | 9.18 |
Forfeited |  | (126,178 | ) |  |  | 12.89 |
Unvested balance at March 31, 2021 |  | 462,243 |  |  | $ | 8.37 |
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 is as follows:
| Three Months Ended March 31, |
In Thousands | 2021 |  |  | 2020 |
Grant-date fair value | $ | 251 |  |  | $ | 510 |
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 as follows:
| Three Months Ended March 31, |
In Thousands | 2021 |  |  | 2020 |
Deemed dividends from grants to Cellectis employees | $ | 79 |  |  | $ | 224 |
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 is as follows:
| Three Months Ended March 31, |
In Thousands | 2021 |  |  | 2020 |
Stock-based compensation expense | $ | (396 | ) |  | $ | 1,006 |
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 is as follows:
| Three Months Ended March 31, |
In Thousands | 2021 |  |  | 2020 |
Stock-based compensation expense | $ | (749 | ) |  | $ | 155 |
Performance 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 performance stock units is as follows:
| Three Months Ended March 31, |
In Thousands | 2021 |  |  | 2020 |
Stock-based compensation expense | $ | (305 | ) |  | $ | 110 |

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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding restricted stock units that are fully vested and expected to vest. Includes, but is not limited to, unvested restricted stock units for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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