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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock-based Compensation Expense
The following table summarizes stock-based compensation expense recognized for the periods presented:
Three Months Ended March 31,
(in thousands)20232022
Equity Awards
Restricted stock$10,673 $3,439 
Stock option awards31 
Performance stock units7,197 2,003 
Other stock-based compensation expense(1)
— 72 
Total stock-based compensation - equity awards17,871 5,545 
Liability Awards
Performance stock units— 13,720 
Total stock-based compensation expense$17,871 $19,265 
(1)     Includes expenses related to the Company’s Employee Stock Purchase Plan (the “ESPP”). In May 2019, an aggregate of 2,000,000 shares were authorized by stockholders for issuance under the ESPP, which became effective on July 1, 2019. As of January 1, 2023, the Company no longer offers the ESPP.
Schedule of Restricted Stock Activity
The following table provides information about restricted stock activity during the three months ended March 31, 2023:
Restricted StockWeighted Average Fair Value
Unvested balance as of December 31, 20228,182,705 $6.03 
Granted359,322 8.73 
Vested(928,649)8.91 
Forfeited(293,863)7.58 
Unvested balance as of March 31, 20237,319,515 6.22 
Summary of Stock Option Activity
The following table provides information about stock option awards outstanding during the three months ended March 31, 2023:
OptionsWeighted Average Exercise PriceWeighted Average Remaining Term
(in years)
Aggregate Intrinsic Value
(in thousands)
Outstanding as of December 31, 20222,056,467 $15.44 
Granted— — 
Exercised(39,333)5.88 $168 
Forfeited— — 
Expired(502,000)15.17 
Outstanding as of March 31, 20231,515,134 15.77 3.9$497 
Exercisable as of March 31, 20231,501,132 15.92 3.9$353 
Schedule of Variable Performance Stock Units Valuation Assumptions The following table summarizes the key assumptions and related information used to determine the fair value of performance stock units granted during the three months ended March 31, 2023:
2023 Awards
Number of PSUs granted237,097
Weighted average fair value$16.68
Number of simulations10,000,000
Expected implied stock volatility59.2%
Risk-free interest rate4.1%