For the three-month periods ended June 30, 2023 and 2022, our total stock-based compensation expense, which includes reversals of expense for certain forfeited or cancelled awards, was $(33,841) and $40,555, respectively. For the six-month periods ended June 30, 2023 and 2022, our total stock-based compensation expense, which includes reversals of expense for certain forfeited or cancelled awards, was $(14,172) and $225,405, respectively. We have not recorded any income tax benefit related to stock-based compensation in any of the three-month or six-month periods ended June 30, 2023 and 2022.

A summary of the status of our stock options as of June 30, 2023, and changes during the six-month period then ended, is presented below.

The weighted average grant date fair value per stock option granted during the six-month period ended June 30, 2023 was $0.24. Key assumptions used in the Black-Scholes option pricing model for stock options granted during the six-month period ended June 30, 2023 were the Company’s stock price, an expected volatility rate of 89.47%, a risk-free rate of 3.87%, and an expected life of 5.95 years.

A summary of the status of our unvested restricted stock as of June 30, 2023, and changes during the six-month period then ended, is presented below.

As of June 30, 2023, there was $150,429 of total unrecognized compensation expense related to unvested stock-based awards, which we expect to recognize over the remaining weighted average vesting term of 1.72 years.