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Stock-Based Compensation | 9 Months Ended
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Sep. 30, 2021
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation |
16. | Stock–Based Compensation
On June 4, 2021, our stockholders approved the Amended and Restated 2019 Equity and Incentive Plan (the “Amended 2019 Plan”), which had previously been adopted by the Company’s Board of Directors subject to stockholder approval. The Amended 2019 Plan amends and restates the Company’s 2019 Equity and Incentive Plan (the "Original 2019 Plan") to provide that (i) 4,500,000 shares of the Company’s common stock, reduced by the number of shares of the Company’s common stock subject to awards granted under the Original 2019 Plan between March 21, 2021 and June 4, 2021, will be available for the issuance of new awards under the Amended 2019 Plan after the date of the annual meeting of stockholders which occurred on June 4, 2021, (ii) 1,235,669 shares of the Company’s common stock will be reserved for issuance in respect of awards granted under the Original 2019 Plan between May 9, 2019 and March 21, 2021, and (iii) the number of shares of the Company’s common stock as is equal to the number of shares of the Company’s common stock subject to awards granted under the Company’s 2010 Equity and Incentive Plan, which awards expire, terminate or are otherwise surrendered, cancelled, forfeited or repurchased by the Company pursuant to a contractual repurchase right will be made available for the issuance of awards under the Amended 2019 Plan. Under the Amended 2019 Plan, the Company regularly grants equity awards in the form of stock options, restricted stock, restricted stock units and other stock-based awards to certain employees and directors. The fair value of restricted stock units, DSUs and performance-based restricted stock units, excluding awards that include a TSR provision, is based on the closing market price of the Company’s stock on the grant date as reported by the NYSE. The fair value of each service-based stock option award is estimated on the grant date using a Black-Scholes-Merton option-pricing model. The fair value of awards with market-based performance conditions, including those with TSR provisions, is estimated on the grant date using a Monte-Carlo simulation pricing model. Stock-based compensation expense was $21.7 million and $60.3 million for the three and nine months ended September 30, 2021, respectively, and $17.9 million and $44.6 million for the three and nine months ended September 30, 2020, respectively.

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