|6 Months Ended|
Jun. 30, 2021
|Stock-Based Compensation||Stock-Based Compensation
We adopted a 2006 Stock Option and Incentive Plan, or the Plan, under which the Board of Directors may grant incentive or non-qualified stock options and stock grants to key employees, directors, advisors and consultants. The Plan was amended at various dates by the Board of Directors to increase the reserved shares of common stock issuable under the Amended Plan to 3,838,750 as of June 30, 2021, and in June 2017 stockholders approved an amendment to extend the termination date of the Plan to January 1, 2026 and ratified all of our option grants issued after January 1, 2016 (the "Amended Plan").
Stock options vest based upon the terms within the individual option grants, with an acceleration of the unvested portion of such options upon a change in control event, as defined in the Amended Plan. The options are not transferable except by will or domestic relations order. The option price per share under the Amended Plan cannot be less than the fair market value of the underlying shares on the date of the grant. The number of shares remaining available for future issuance under the Amended Plan as of June 30, 2021 was 807,312.
Stock option activity for the six months ended June 30, 2021 was as follows:
Consolidated stock-based compensation expense for the three and six months ended June 30, 2021 and 2020 was $54,681 and $93,766 and $39,494 and $81,730, respectively. No tax benefit was recognized related to the stock-based compensation recorded during the period.
At June 30, 2021 the total compensation cost related to unvested stock option awards not yet recognized is $563,847 and this amount will be recognized over a weighted average period of 2.12 years.
The entire disclosure for shareholders' equity and share-based payment arrangement. Includes, but is not limited to, disclosure of policy and terms of share-based payment arrangement, deferred compensation arrangement, and employee stock purchase plan (ESPP).
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef