Share-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Summary of Share-Based Compensation Expenses by Operating Function

The following table summarizes share-based compensation expense by operating function for the periods presented:

	Twelve months ended Dec. 31,
(in thousands)	2023		2022		2021
Marketing and advertising	$	328	$	1,653	$	2,108
Customer care and enrollment	2,307		2,218		3,775
Technology	3,000		2,924		3,775
General and administrative (1)	13,929		25,329		17,639
Total share-based compensation expense	$	19,564	$	32,124	$	27,297

(1)For the twelve months ended December 31, 2023 and 2022, share-based compensation expense includes expense related to the stock appreciation rights ("SARs"), which are liability classified awards.

Summary of Non-option Equity Awards Issued to Employees

A summary of the Time-Vesting Units issued is as follows:

(in thousands except per share amounts)	Number of Time-Vesting Units	Weighted Average Grant Date Fair Value
Unvested units at Dec. 31, 2022	48	$	26.15
Granted	—	—
Vested	(30)	24.87
Forfeited	(5)	23.89
Unvested units at Dec. 31, 2023	13	$	29.97

Schedule of RSUs Issued

A summary of the RSUs issued is as follows:

(in thousands except per share amounts)	Number of RSUs	Weighted Average Grant Date Fair Value
Unvested units at Dec. 31, 2022	1,097	$	20.71
Granted	1,161	15.28
Vested	(531)	21.82
Forfeited	(390)	19.46
Unvested units at Dec. 31, 2023	1,337	$	15.92

Summary of Stock Options Issued to Employees

A summary of the stock options issued to employees is as follows:

(in thousands except per share amounts)	Number of Stock Options	Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value(1)
Outstanding at Dec. 31, 2022	436	$	62.63	8.8	$	1
Granted	100	8.30
Exercised	(5)	145.79
Forfeited	(21)	131.05
Expired	(41)	149.04
Outstanding at Dec. 31, 2023	469	$	39.54	8.3	$	383
Exercisable at Dec. 31, 2023	153	$	88.81	7.5	$	96

(1)The aggregate intrinsic value is calculated as the product between the Company’s closing stock price as of December 31, 2023 and 2022 and the exercise price of in-the-money options as of those dates.

Schedule of Stock Options Valuation Assumptions

The fair value of stock options with a requisite service period of three years is determined using the Black-Scholes option pricing model using the following assumptions:

	Twelve months ended Dec. 31, 2023
Risk free interest rate	3.5%
Expected volatility	90.3%
Expected life (years)	6.00
Expected dividend yield	0.0%

Schedule of PSUs Issued

A summary of the PSUs issued is as follows:

(in thousands except per share amounts)	Number of PSUs	Weighted Average Fair Value at Date of Grant Per Unit
Unvested units at December 31, 2022	214	$	38.46
Granted	100	14.10
Vested	(3)	332.55
Forfeited	(7)	332.55
Unvested units at December 31, 2023	304	$	20.77