Stock-Based Compensation |
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Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Stock-Based Compensation |
Note 8. Stock-Based Compensation Shares of common stock reserved for issuance under the Company’s equity incentive plans were as follows:
Stock Option Activity A summary of the Company’s stock option activity (excluding performance-based stock option activity summarized further below) under the 2011 Plan, 2019 Plan, and Inducement Plan for the six months ended June 30, 2022 was as follows:
The weighted-average grant date fair value of options granted was $3.19 and $12.34 per share for the three months ended June 30, 2022 and 2021, and $3.99 and $13.55 per share for the six months ended June 30, 2022 and 2021, respectively. As of June 30, 2022, the unrecognized stock-based compensation cost of unvested options was $14.3 million, which is expected to be recognized over a weighted-average period of 2.1 years. Valuation of Stock Options The Company estimated the fair value of stock options (excluding performance-based stock options discussed below) using the Black-Scholes option-pricing model. The fair value of stock options is recognized on a straight-line basis over the requisite service periods of the awards. The fair value of stock options was estimated using the following weighted-average assumptions:
Performance-Based Stock Option Activity No performance-based stock option activity occurred during the six months ended June 30, 2022. As of June 30, 2022, stock options for 421,000 shares with an exercise price of $5.10 and a remaining contractual term of 7.71 years remained outstanding. The stock options are fully vested and exercisable and had no intrinsic value as of June 30, 2022.
Restricted Stock Units Activity and Valuation A summary of the Company’s RSU activity under the 2019 Plan and Inducement Plan for the six months ended June 30, 2022 was as follows:
As of June 30, 2022, the unrecognized stock-based compensation cost of unvested RSUs was $21.3 million, which is expected to be recognized over a weighted-average period of 2.5 years. ESPP Activity and Valuation During the six months ended June 30, 2022 and 2021, 204,775 and 57,001 shares of common stock were purchased under the ESPP, respectively. The fair value of stock purchase rights granted under the ESPP was estimated using the following assumptions:
Stock-Based Compensation Expense The following is a summary of stock-based compensation expense by award type (in thousands):
The following is a summary of stock-based compensation expense by function (in thousands):
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