Total share-based expense related to stock options, restricted stock units and common stock awards was approximately $0.1 million for each of the three months ended June 30, 2022 and 2021 and approximately $0.3 million and $0.2 million for the six months ended June 30, 2022 and 2021, respectively.

Share-based compensation expense is classified in the condensed consolidated statements of operations as follows:

Employee Stock Options

During the six months ended June 30, 2022, the Company granted 200,000 stock option awards to purchase shares of common stock. The weighted average grant date fair value per option share was $0.99. Key assumptions used in the Black-Scholes option pricing model for options granted during the six months ending June 30, 2022 were the Company’s stock price, a risk free rate of 2.38%, an expected life of 5.88 years and an expected volatility rate of 126.32%. During the six months ended June 30, 2021, the Company granted 200,000 stock option awards to purchase shares of common stock. The Company recognized a total of $0.1 million of compensation expense related to employee stock options during each of the three months ended June 30, 2022 and 2021 and $0.3 million and $0.2 million during the six months ended June 30, 2022 and 2021, respectively.

Non-Employee Stock Options

The Company did not grant any non-employee stock options during the six months ended June 30, 2022 and 2021. The Company did not recognize any expense related to non-employee stock options during the three and six months ended June 30, 2022 and 2021, respectively.