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 September 30, 2023 and 2022 and approximately $0.2 million and $0.4 million for the nine months ended September 30, 2023 and 2022, respectively.

Share-based 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 nine months ended September 30, 2023. During the nine months ended September 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 share-based expense related to employee stock options during each of the three months ended September 30, 2023 and 2022 and $0.2 million and $0.4 million during the nine months ended September 30, 2023 and 2022, respectively. No employee stock options or RSUs were exercised and none expired during the three and nine months ended September 30, 2023 and 2022.

Non-Employee Stock Options

There were no non-employee stock options granted or exercised during the three and nine months ended September 30, 2023 and 2022, respectively. During the nine months ended September 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 nine months ended September 30, 2022. The Company did not recognize any share-based expense related to non-employee stock options during the three and nine months ended September 30, 2023 and 2022, respectively.