We have a long–term incentive plan for our directors, officers, employees, consultants and advisors. This plan allows for the issuance of stock options (both incentive and non–qualified), stock appreciation rights, restricted stock awards, restricted stock units (“RSUs”), other stock–based awards and cash–based awards. As of December 31, 2019, we have 2.8 million shares authorized for issuance under this plan, and 2.0 million shares remain available for grant.

Awards that expire or are cancelled without delivery of shares generally become available for issuance under this plan. Shares that are used or withheld to satisfy tax obligations are not available for issuance under this plan. We can either issue new shares, use shares held in treasury or purchase shares of our common stock to satisfy vesting of awards under this plan.

An RSU is an award where each unit represents the right to receive the value of one share of our common stock at the date of vesting. RSUs may be settled by, at our discretion, either the issuance of our common stock, cash or a combination thereof based on the fair market value of the common stock on the date of exercise.

	Number of RSUs			Weighted Average Grant Date Fair Value
Nonvested at January 1, 2019		258,917		$	26.60
Granted		746,612			3.39
Vested		(278,402	)		3.39
Forfeited		(614,824	)		11.62
Nonvested at December 31, 2019		112,303		$	11.86

In March 2019, we issued 0.5 million RSUs to our senior management, which vested 50% on April 12, 2019 and the remaining 50% will vest on January 29, 2021, and an additional 0.2 million RSUs, all of which vest on September 29, 2020. As of December 31, 2019, there are 27,229 RSUs vesting on September 29, 2020 and 85,074 RSUs vesting on January 29, 2021.

The fair value of RSUs granted in 2019 and 2018 was $2.5 million and $14.2 million, respectively. The fair value of RSUs vested in 2019 and 2018 was $1.1 million and $5.3 million, respectively.

As of December 31, 2019, we had $0.6 million of unrecognized compensation cost related to unvested RSUs which is expected to be recognized over a weighted average period of 1.05 years.

Additionally, as of December 31, 2019, we have 0.1 million RSUs that are vested but have not yet settled. These RSUs were granted to our outside directors in 2018.

Equity–based compensation cost is measured at the date of grant based on the calculated fair value of the award and is generally recognized on a straight–line basis over the requisite service period, including those with graded vesting. Forfeitures are accounted for as they occur.

We recognized equity–based compensation costs of $(0.1) million and $10.1 million in 2019 and 2018, respectively. Included in these costs for 2019 is $3.8 million related to the forfeiture of unvested RSUs. Included in these costs for 2018 is $5.7 million related to the acceleration of vesting of certain RSUs. These costs are included in “Selling, general and administrative expenses” on our consolidated statements of operations.