We currently have four types of share-based awards outstanding to our employees and directors: stock options, restricted stock awards, restricted stock units, and performance stock units. All market stock units that were outstanding at the beginning of 2019 were forfeited and are no longer outstanding as of September 30, 2019. 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.

In March 2019, we granted the following 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 and nine months ended September 30, 2019, we recognized total share-based compensation costs of $6.0 million and $15.3 million, respectively, including $0.6 million recorded to restructuring and related charges for the nine months ended September 30, 2019. For the three and nine months ended September 30, 2018, we recognized total share-based compensation costs of $1.7 million and $4.9 million, respectively. We account for forfeitures as they occur.

A summary of our stock options as of September 30, 2019 and the changes during the nine 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		(71	)		12.05
Forfeited		(20	)		37.69
Expired		—			—
Outstanding at September 30, 2019		340		$	17.87		3.8	$	861
Exercisable at September 30, 2019		300		$	15.23		3.1	$	861

The following table shows a summary of our restricted stock awards as of September 30, 2019, as well as activity during the nine 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		(44	)		19.42
Forfeited		(1	)		19.42
Nonvested at September 30, 2019		213		$	19.42

The following table shows a summary of our restricted stock units as of September 30, 2019, as well as activity during the nine months then ended:

	Restricted Stock Units
	Shares (In thousands)			Weighted- Average Grant Date Fair Value
Nonvested at January 1, 2019		271		$	24.07
Granted		414			19.72
Replacement Awards		919			19.42
Vested		(329	)		20.42
Forfeited		(63	)		23.08
Nonvested at September 30, 2019		1,212		$	20.10

The following table shows a summary of our performance stock units as of September 30, 2019, as well as activity during the nine months then ended:

	Performance Stock Units
	Shares (In thousands)			Weighted- Average Grant Date Fair Value
Nonvested at January 1, 2019		—		$	—
Granted		806			20.19
Vested		—
Forfeited		(1	)		20.36
Nonvested at September 30, 2019		805		$	20.19

The following table shows a summary of our market stock units as of September 30, 2019, as well as activity during the nine 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		(45	)		18.25
Nonvested at September 30, 2019		—		$	—