The Company currently has one equity incentive plan (the “2010 Plan”), which provides for awards in the form of restricted shares, stock units, stock options or stock appreciation rights to the Company’s employees, officers, directors and consultants. In April 2014, SemiLEDs’ stockholders approved an amendment to the 2010 Plan that increased the number of shares authorized for issuance under the plan by an additional 250 thousand shares. On July 31, 2019, the stockholders approved an increase in the authorized share reserve under the 2010 plan by an additional 500 thousand shares, to extend expiration of the 2010 Plan to November 3, 2023, to remove the IRS Code section 162(m) provisions, and to modify the maximum grant limit to 35 thousand shares to one person in a one year period. On September 25, 2020, stockholders approved the amended 2010 Equity Incentive Plan to increase the authorized shares reserve by an additional 400 thousand shares.

Prior to SemiLEDs’ initial public offering, the Company had another stock‑based compensation plan (the “2005 Plan”), but awards are made from the 2010 Plan after the initial public offering. Options outstanding under the 2005 Plan continue to be governed by its existing terms.

A total of 1,421 thousand and 1,421 thousand shares was reserved for issuance under the 2010 Plan as of February 28, 2022 and 2021, respectively. As of February 28, 2022 and 2021 there were 809 thousand and 1,048 thousand shares of common stock available for future issuance under the equity incentive plans, respectively.

In November 2021, SemiLEDs granted 15 thousand restricted stock units to its directors that vest 25% every three months on February 12, 2022, May 12, 2022, August 12, 2022 and November 12, 2022. In the event that the 2022 annual meeting falls before November 12, 2022, 100% of the stock units shall immediately vest on the date of the 2022 annual meeting. The grant-date fair value of the restricted stock units was $7.10 per unit.

In November 2021, SemiLEDs granted 98.5 thousand restricted stock units to its employees, which vest 12.5% every three months on the vesting commencement date of November 2021 and will become fully vested upon a change in control. The grant-date fair value of the restricted stock units was $7.10 per unit.

In November 2020, SemiLEDs granted 15 thousand restricted stock units to its directors, which vested 25% every three months on February 12, 2021, May 12, 2021 and August 12, 2021. The remaining stock units vested on September 24, 2021, the date of the 2021 annual meeting. The grant-date fair value of the restricted stock units was $3.00 per unit.

In November 2020, SemiLEDs granted 33 thousand restricted stock units to its employees, which vested 25% every three months on February 12, 2021, May 12, 2021, August 12, 2021 and November 12, 2021. The grant-date fair value of the restricted stock units was $3.00 per unit.

In January 2020, SemiLEDs granted 136 thousand restricted stock units to its employees, which vest 25% each year on January 10, 2021, 2022, 2023 and 2024 and will become fully vested upon a change in control. The grant-date fair value of the restricted stock units was $2.39 per unit.

The grant date fair value of stock options is determined using the Black-Scholes option-pricing model. The Black-Scholes option-pricing model requires inputs including the market price of SemiLEDs’ common stock on the date of grant, the term that the stock options are expected to be outstanding, the implied stock volatilities of several of the Company’s publicly-traded peers over the expected term of stock options, risk-free interest rate and expected dividend. Each of these inputs is subjective and generally requires significant judgment to determine. The grant date fair value of stock units is based upon the market price of SemiLEDs’ common stock on the date of the grant. This fair value is amortized to compensation expense over the vesting term.

Stock-based compensation expense is recorded net of estimated forfeitures such that expense is recorded only for those stock-based awards that are expected to vest. A forfeiture rate is estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from initial estimates. A forfeiture rate of zero is estimated for stock-based awards with vesting term that is less than or equal to one year from the date of grant.

A summary of the stock-based compensation expense for the three and six months ended February 28, 2022 and February 28, 2021 was as follows (in thousands):

	Three Months Ended				Six Months Ended
	February 28, 2022		February 28, 2021		February 28, 2022		February 28, 2021
Cost of revenues	$	42	$	18	$	54	$	23
Research and development		44		15		54		19
Selling, general and administrative		68		33		89		45
	$	154	$	66	$	197	$	87