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Share-based Compensation
 3 Months Ended
Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Share-based Compensation Stock-based Compensation
For the three months ended March 31, 2023 and 2022, stock-based compensation expense was as follows:
Three Months Ended March 31,
(in thousands)20232022
Stock-based compensation expense$1,936 $1,558 
Income tax benefit for stock-based compensation was immaterial for the three months ended March 31, 2023 and 2022. No stock-based compensation has been capitalized.
2018 Plan
The Company's 2018 Plan initially provided for the issuance of up to 6,685,696 shares of the Company's Common Stock. On March 17, 2022, the Company's Board of Directors unanimously approved an amendment to the 2018 Plan, which was subsequently approved by our shareholders, to increase the number of shares authorized for issuance under the plan by 2,500,000 shares, resulting in 9,185,696 shares of the Company's Common Stock authorized for issuance under the plan.
2021 Stock Purchase Plan
The 2021 Stock Purchase Plan provides for up to 200,000 shares to be purchased under the plan. Shares issued under the plan may be authorized but unissued or reacquired shares of Common Stock. All employees of the Company who work more than 20 hours per week and have been employed by the Company for at least 30 days may participate in the 2021 Stock Purchase Plan.
Under the 2021 Stock Purchase Plan, participants are offered, on the first day of the offering period, the option to purchase shares of Common Stock at a discount on the last day of the offering period. The offering period shall be for a period of three months, and the first offering period began on January 10, 2022. The 2021 Stock Purchase Plan provides eligible employees the opportunity to purchase shares of the Company's Common Stock on a quarterly basis through payroll deductions at a price equal to 95% of the lesser of the fair value on the first and last trading day of each offering period. The compensation expense for the three months ended March 31, 2023, was immaterial and is included in stock-based compensation in the table above.