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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

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