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Stock-Based Compensation | 9 Months Ended
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Sep. 30, 2022
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation |
14. | STOCK-BASED COMPENSATION
The Company has one stock-based compensation plan, the 2014 Stock Incentive Plan (Plan), approved by Trex stockholders in April 2014. The Plan is administered by the Compensation Committee of the Trex Board of Directors. Stock-based compensation is granted to officers, directors and certain key employees in accordance with the provisions of the Plan. The Plan provides for grants of stock options, restricted stock, restricted stock units, stock appreciation rights (SARs), and unrestricted stock. The total aggregate number of shares of Trex common stock that may be issued under the Plan is 25,680,000 and as of September 30, 2022, the total number of shares available for future issuance is 11,060,097.​​​​​​​ The following table summarizes the Company’s stock-based compensation grants for the nine months ended September 30, 2022:
|  | Stock Awards Granted |  |  | Weighted-Average Grant Price Per Share |
Time-based restricted stock units |  |  | 56,818 |  |  | $ | 56.18 |
Performance-based restricted stock units (a) |  |  | 72,152 |  |  | $ | 76.14 |
Stock appreciation rights |  |  | 32,971 |  |  | $ | 82.01 |
(a) | Includes 47,072 of target performance-based restricted stock unit awards granted during the nine months ended September 30, 2022, and adjustments of 8,160, 11,684, and 5,236 to grants due to the actual performance level achieved for restricted stock and restricted stock units awarded in 2021, 2020, and 2019, respectively.
The fair value of each SAR is estimated on the date of grant using a Black-Scholes option-pricing formula. For SARs issued in the nine months ended September 30, 2022, and September 30, 2021, the data and assumptions shown in the following table were used:
|  | Nine Months Ended September 30, 2022 |  |  | Nine Months Ended September 30, 2021 |
Weighted-average fair value of grants |  | $ | 33.9 |  |  | $ | 51.84 |
Dividend yield |  |  | 0 | % |  |  | 0 | %
Average risk-free interest rate |  |  | 1.9 | % |  |  | 0.6 | %
Expected term (years) |  |  | 5 |  |  |  | 5 |
Expected volatility |  |  | 44.85 | % |  |  | 58.7 | %
The Company recognizes stock-based compensation expense ratably over the period from the grant date to the earlier of: (1) the vesting date of the award, or (2) the date the grantee is eligible to retire without forfeiting the award. For performance-based restricted stock and performance-based restricted stock units, expense is recognized ratably over the performance and vesting period of each tranche based on management’s judgment of the ultimate award that is likely to be paid out based on the achievement of the predetermined performance measures. For the employee stock purchase plan, compensation expense is recognized related to the discount on purchases. Stock-based compensation expense is included in “Selling, general and administrative expenses” in the Condensed Consolidated Statements of Comprehensive Income. The following table summarizes the Company’s stock-based compensation expense (in thousands):​​​​​​​
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Stock appreciation rights |  | $ | 196 |  |  | $ | 94 |  |  | $ | 547 |  |  | $ | 352 |
Time-based restricted stock and restricted stock units |  |  | 1,012 |  |  |  | 692 |  |  |  | 2,818 |  |  |  | 2,133 |
Performance-based restricted stock and restricted stock units |  |  | (1,012 | ) |  |  | 1,047 |  |  |  | (5 | ) |  |  | 3,487 |
Employee stock purchase plan |  |  | 52 |  |  |  | 54 |  |  |  | 171 |  |  |  | 223 |
Total stock-based compensation |  | $ | 248 |  |  | $ | 1,887 |  |  | $ | 3,531 |  |  | $ | 6,195 |
Total unrecognized compensation cost related to unvested awards as of September 30, 2022, was $6.3 million. The cost of these unvested awards is being recognized over the requisite vesting period of each award.

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