We currently have five types of share-based awards outstanding to our employees and directors: stock options, restricted stock awards, restricted stock units, performance stock units, and market stock units. We believe that our share-based awards align the interests of our employees and directors with those of our stockholders. Each of these award types generally vests over three or four years.

During the three months ended March 31, 2019, we granted the following awards to employees of Nutrisystem in replacement of their unvested equity awards as of Closing (“Replacement Awards”): (i) approximately 258,000 time-vesting restricted stock awards at a fair value of $19.42 per share and (ii) approximately 919,000 time-vesting restricted stock units at a fair value of $19.42 per share. Approximately $9.1 million of the fair value of the Replacement Awards was attributable to pre-combination service and was included in the purchase price of Nutrisystem (see Note 2). Post-combination expense related to the Replacement Awards of approximately $13.7 million is expected to be recognized over the remaining post-combination requisite service period.

We recognize share-based compensation expense for the market stock units if the requisite service period is rendered, even if the market condition is never satisfied. For the three months ended March 31, 2019, we recognized total share-based compensation costs of $2.4 million, including $0.1 million recorded to restructuring and related charges. For the three months ended March 31, 2018, we recognized total share-based compensation costs of $1.4 million. We account for forfeitures as they occur.

A summary of our stock options as of March 31, 2019 and the changes during the three months then ended is presented below:

Options	Shares (In thousands)			Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Term		Aggregate Intrinsic Value (In thousands)
Outstanding at January 1, 2019		431		$	17.83
Granted		—			—
Exercised		(35	)		10.70
Forfeited		—			—
Expired		—			—
Outstanding at March 31, 2019		396		$	18.46		4.4	$	1,262
Exercisable at March 31, 2019		316		$	13.57		3.3	$	1,262

The following table shows a summary of our restricted stock awards as of March 31, 2019, as well as activity during the three months then ended:

	Restricted Stock Awards
	Shares (In thousands)		Weighted- Average Grant Date Fair Value
Nonvested at January 1, 2019		—	$	—
Granted		—		—
Replacement Awards		258		19.42
Vested		—		—
Forfeited		—		—
Nonvested at March 31, 2019		258	$	19.42

The following table shows a summary of our restricted stock units as of March 31, 2019, as well as activity during the three months then ended:

	Restricted Stock Units
	Shares (In thousands)			Weighted- Average Grant Date Fair Value
Nonvested at January 1, 2019		271		$	24.07
Granted		141			19.42
Replacement Awards		919			19.42
Vested		(68	)		11.42
Forfeited		—			—
Nonvested at March 31, 2019		1,263		$	20.84

The following table shows a summary of our performance stock units as of March 31, 2019, as well as activity during the three months then ended:

	Performance Stock Units
	Shares (In thousands)		Weighted- Average Grant Date Fair Value
Nonvested at January 1, 2019		—	$	—
Granted		103		19.42
Vested		—
Forfeited		—
Nonvested at March 31, 2019		103	$	19.42

The following table shows a summary of our market stock units as of March 31, 2019, as well as activity during the three months then ended:

	Market Stock Units
	Shares (In thousands)		Weighted- Average Grant Date Fair Value
Nonvested at January 1, 2019		45	$	18.25
Granted		—		—
Vested		—		—
Forfeited		—		—
Nonvested at March 31, 2019		45	$	18.25