17.   Share-Based Compensation

The following table summarizes the components of share-based compensation expense in the condensed consolidated statements of operations (in thousands):

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Stock Options

2008 Omnibus Equity Incentive Plan (the “2008 Plan”)

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On August 12, 2008, the Company adopted the 2008 Plan for employees, officers, directors and external service providers. The 2008 Plan provided that the Company could grant options to purchase stock and/or make awards of restricted stock. Stock options granted under the 2008 Plan could either be incentive stock options (as defined by Section 422 of the Internal Revenue Code of 1986, as amended) or non-qualified stock options at the discretion of the Board of Directors. Vesting of service awards occurred ratably on the anniversary of the grant date over the service period, generally three or five years, as determined at the time of grant. Vesting of performance awards occurred when the performance criteria had been satisfied. The Company used historical data to estimate forfeiture rates. The 2008 Plan had a term of ten (10) years and, as a result, the 2008 Plan expired by its terms on August 12, 2018.

iBio, Inc. 2018 Omnibus Equity Incentive Plan (the "2018 Plan")

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On December 18, 2018, the Company’s stockholders, upon recommendation of the Board of Directors on November 9, 2018, approved the 2018 Plan. On March 5, 2020, at the Company's 2019 Annual Meeting of Stockholders, the Company's stockholders approved an amendment to the 2018 Plan to increase the number of shares of Common Stock authorized for issuance thereunder from 3.5 million shares to 6.5 million shares and to incorporate changes to include restricted stock units and performance-based awards as grant types issuable under the 2018 Plan. The total number of shares of Common Stock reserved under the 2018 Plan is 6.5 million. Stock options granted under the 2018 Plan may be either incentive stock options (as defined by Section 422 of the Internal Revenue Code of 1986, as amended), non-qualified stock options, or restricted stock and determined at the discretion of the Board of Directors.

Vesting of service awards was determined by the Board of Directors and stated in the award agreements. In general, vesting occurred ratably on the anniversary of the grant date over the service period, generally three or five years, as determined at the time of grant. Vesting of performance awards occurred when the performance criteria was satisfied. The Company used historical data to estimate forfeiture rates. The 2018 Plan was terminated with the adoption of the iBio, Inc. 2020 Omnibus Equity Incentive Plan (see below).

iBio, Inc. 2020 Omnibus Equity Incentive Plan (the “2020 Plan”)

On December 9, 2020, the Company's stockholders approved the 2020 Plan as a successor to the 2018 Plan. The total number of shares of Common Stock reserved under the 2020 Plan is 32 million shares of Common Stock for issuance pursuant to the grant of new awards under the 2020 Plan. The 2020 Plan allows for the award of stock options, stock appreciation rights, restricted stock, restricted stock units, unrestricted stock, cash-based awards, and dividend equivalent rights. The value of all awards awarded under the 2020 Plan and all other cash compensation paid by the Company to any non-employee director in any calendar year may not exceed $500,000; provided, however, that such amount shall be $750,000 for the calendar year in which the applicable non-employee director is initially elected or appointed to the Board of Directors and $1,500,000 for any non-executive chair of our Board of Directors should one be appointed. Notwithstanding the foregoing, the independent members of the Board of Directors may make exceptions to such limits in extraordinary circumstances. The term of the 2020 Plan will expire on the tenth anniversary of the date the Plan is approved by the stockholders.

Stock options issued under the plans during the three months ended September 30, 2021, were as follows:

Stock options issued under the 2020 Plan during the three months ended December 31, 2021, were as follows:

The Company estimated the fair value of options granted using the Black-Scholes option pricing model with the following assumptions:

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Restricted Stock Units “RSUs”

On August 23, 2021, the Company issued RSUs to acquire 105,723 shares of Common Stock for various employees at a market value of $1.26 per share. The RSUs vest over a four-year period. The grant-date fair value of the RSUs totaled approximately $133,000.