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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Unvested Restricted Stock Awards The following table sets forth the number of unvested restricted stock awards and the weighted-average fair value of these awards at the date of grant:
Restricted Awards Weighted Average Fair Value at Grant Date
Aggregate Intrinsic Value(1)($000s)
Unvested balance December 31, 20221,356,389 $11.11 
Granted1,505,876 $5.78 
Forfeited(66,088)$8.00 
Vested(699,184)$11.04 
Unvested balance, December 31, 20232,096,993 $7.41 $12,121 
(1)
The aggregate intrinsic value is calculated using the market value of our common stock as of December 29, 2023. The market value as of December 29, 2023 was $5.78 per share, which was the closing price of our common stock reported for transactions effected on the NASDAQ Global Select Market on December 29, 2023, the final trading day of 2023.
Schedule of Unvested Performance-based Restricted Stock Units Awards The following table sets forth the number of unvested PSUs and the weighted-average fair value of these awards at the date of grant:
Performance Awards Weighted Average Fair Value at Grant Date
Aggregate Intrinsic Value(1)($000s)
Unvested balance December 31, 2022847,146 $15.07 
Granted449,614 $8.22 
Forfeited— $— 
Vested(243,572)$15.46 
Unvested balance, December 31, 20231,053,188 $12.06 $6,087 
(1)
The aggregate intrinsic value is calculated using the market value of our common stock as of December 29, 2023. The market value as of December 29, 2023 was $5.78 per share, which was the closing price of our common stock reported for transactions effected on the NASDAQ Global Select Market on December 29, 2023, the final trading day of 2023.
Schedule of Assumptions used to Value PSUs Granted The following table summarizes the assumptions used to value the PSUs granted during the years ended December 31, 2023, 2022 and 2021:
Year Ended December 31,
202320222021
Expected term (years)3.03.03.0
Expected volatility56.8 %40.6 %57.1 %
Expected annual dividend0.0 %0.0 %0.0 %
Risk free rate4.4 %1.8 %0.2 %
Summary of Assumptions used to Value Purchase Rights Granted Under ESPP The following table summarizes the assumptions used to value the purchase rights granted under the ESPP during the years ended December 31, 2023, 2022 and 2021:
Year Ended December 31,
202320222021
Expected term (years)
0.5
0.5
0.5
Expected volatility58.0 %12.0 %28.0 %
Expected annual dividend12.2 %6.1 %5.5 %
Risk free rate5.4 %2.5 %0.1 %