awards earned at 200% of the target. The annual achievement levels are averaged over the three-year performance period and the earned amounts, if any, vest on March 31, 2024. The Company includes these cash-based awards in other current liabilities on the consolidated balance sheet, effective as of April 2021.
In addition, during the first nine months of 2021, the Company granted service-based restricted stock units and performance-based restricted stock units to 2 employees. On May 17, 2021, the Company granted 37,500 service-based restricted stock units and performance-based restricted stock units covering a target number of 37,500, and a maximum number of 75,000, shares of common stock, as an inducement award outside of the 2015 Plan at a grant date fair value of $5.00 per share. The service-based restricted stock units vest in full on May 17, 2022 and the earned amounts of the performance-based restricted stock units, if any, vest on March 31, 2024. The performance-based awards have three annual performance periods (fiscal years 2021, 2022 and 2023), with operating income and free cash flow goals (equally weighted) for each year, and threshold performance resulting in awards earned at 50% of the target opportunity and maximum performance resulting in awards earned at 200% of the target. On June 15, 2021, the Company granted 41,666 service-based restricted stock units and performance-based restricted stock units covering a target number of 33,334, and a maximum number of 66,668, shares of common stock under the 2015 Plan at a grant date fair value of $6.27 per share. These awards may be paid in cash or shares at the election of the Compensation Committee of the Board of Directors. The service-based restricted stock units vested with respect to 25,000 shares of common stock on the date of grant (June 15, 2021), while 8,333 will vest on March 31, 2022 and 8,333 will vest on March 31, 2023. The earned amounts of the performance-based restricted stock units, if any, will vest on March 31, 2023 and have two annual performance periods (fiscal years 2021 and 2022), with operating income and free cash flow goals (equally weighted) for each year, and threshold performance resulting in awards earned at 50% of the target opportunity and maximum performance resulting in awards earned at 200% of the target. The initial expense for the 25,000 units that vested at the grant date of June 15, 2021 was $0.2 million.
During the first nine months of 2020, the Company granted 580,312 service-based restricted stock units and 1,178,213 performance-based restricted stock units under the 2020 LTI program and the 2015 Plan, at a grant date fair value of $1.22 per share, which could be paid in cash or shares at the election of the Compensation Committee of the Board of Directors. The service-based restricted stock units vest in equal annual installments over a period of three years. The 2020 performance-based awards have three annual performance periods (fiscal years 2020, 2021 and 2022), with operating income and free cash flow goals (equally weighted) for each year, and threshold performance resulting in awards earned at 50% of the target opportunity and maximum performance resulting in awards earned at 200% of the target. The annual achievement levels are averaged over the three-year performance period and the earned amounts, if any, vest on March 31, 2023. The three-year average payout level for each performance objective replaces the actual payout level for any fiscal year where the actual payout is less than the three-year average.
The Company previously granted (i) performance-based restricted stock units under the 2016 LTI program, which were scheduled to vest if the Company achieved a per share stock price of $5.50 for 30 consecutive trading days prior to August 5, 2021, (ii) performance-based restricted stock units under the 2017 LTI program, which were scheduled to vest if the Company achieved a per share stock price of $6.00 for 30 consecutive trading days prior to March 31, 2021 (pursuant to an extension from the initial vesting date of March 31, 2020, which extension was approved by the Compensation Committee in February 2020), and (iii) performance-based restricted stock units under the 2018 LTI program, which were scheduled to vest if the Company achieved a per share stock price of at least $5.00 for any period of 30 consecutive trading days prior to June 30, 2021 (collectively, the “LTI Performance Awards”). On March 5, 2021, the Compensation Committee of the Board of Directors extended the performance period for each of the LTI Performance Awards to December 31, 2022. In accordance with ASC Topic 718, “Compensation—Stock Compensation” (“ASC 718”), the Company conducted a lattice valuation model in order to revalue the market price for the LTI Performance Awards at the March 5, 2021 modification date. The 2018 LTI program met the market objective by achieving a per share stock price of $5.00 for 30 consecutive days, and approximately 261,463 shares will vest for recipients remaining employed through December 31, 2022. The modification resulted in an approximately $0.8 million incremental cost, which will be expensed over a twenty-month period starting in April 2021.
During the first nine months of 2021, the Compensation Committee of the Board of Directors approved modifying the 2020 performance-based awards granted in 2020. This modification resulted in the adjustment of the 2021 and 2022 performance goals; in addition, the three-year average payout level for each performance objective will replace the actual payout level for any fiscal year (including, without limitation, 2020) where the actual payout is less than the three-year average. As of September 30, 2021, the payout would be 549,181 at threshold, 1,098,362 at target, and 2,196,724 at maximum. The grant price was adjusted from $1.22 per share to $3.49 share per the modification date of March 5, 2021.
During the first nine months of 2021, the Compensation Committee approved modifying the 2019 performance-based restricted stock unit awards. The performance goal for 2020 was year-end backlog performance expressed in margin dollars. Because of