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, 2023 and 2022 and approximately $0.1 million and $0.3 million for the six months ended June 30, 2023 and 2022, respectively.

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

Employee Stock Options

No stock option awards to purchase shares of common stock were granted during the three and six months ended June 30, 2023. During the six months ended June 30, 2022, the Company granted 20,000 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, 2023 and 2022 and $0.1 million and $0.3 million during the six months ended June 30, 2023 and 2022, respectively. No employee stock options or RSUs were exercised and none expired during the three and six months ended June 30, 2023 and 2022.

Non-Employee Stock Options

There were no non-employee stock options granted or exercised during the three and six months ended June 30, 2023 and 2022, respectively. During the six months ended June 30, 2023, non-employee stock option grants to purchase approximately 100 shares of common stock expired. No non-employee stock option grants expired during the six months ended June 30, 2022. The Company did not recognize any expense related to non-employee stock options during the three and six months ended June 30, 2023 and 2022, respectively.