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Equity Compensation and Other Benefit Plans - Restricted Stock Units (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
RSUs With Service Condition |  |  |
Number of Shares |  |  |
Outstanding at beginning of year (in shares) | 921,308 | 712,160 | 457,376
Granted (in shares) | 610,680 | 296,379 | 379,281
Settled (in shares) | (146,440) | (66,125) | (124,497)
Cancelled/forfeited (in shares) | (65,489) | (21,106) |
Outstanding at end of year (in shares) | 1,320,059 | 921,308 | 712,160
Vested but not settled at end of year (in shares) | 635,595 | 394,996 | 285,734
Unvested at end of year (in shares) | 684,464 | 526,312 | 426,426
Weighted Average Grant Date Fair Value Per Share |  |  |
Outstanding at beginning of year (in dollars per share) | $ 18.63 | $ 20.22 | $ 24.76
Granted (in dollars per share) | 10.32 | 17.19 | 16.63
Settled (in dollars per share) | 27.90 | 29.56 | 25.98
Cancelled/forfeited (in dollars per share) | 13.44 | 17.63 |
Outstanding at end of year (in dollars per share) | 14.01 | 18.63 | 20.22
Vested but not settled at end of year (in dollars per share) | 15.63 | 20.67 | 20.89
Unvested at end of year(in dollars per share) | $ 12.52 | $ 17.10 | $ 19.77
RSUs With Market and Service Conditions |  |  |
Number of Shares |  |  |
Outstanding at beginning of year (in shares) | 1,138,495 | 905,708 | 405,806
Granted (in shares) | 997,383 | 381,397 | 602,156
Settled (in shares) | (190,800) | (112,752) | (102,254)
Cancelled/forfeited (in shares) | (77,236) | (35,858) |
Outstanding at end of year (in shares) | 1,867,842 | 1,138,495 | 905,708
Vested but not settled at end of year (in shares) | 560,114 | 190,800 | 112,752
Unvested at end of year (in shares) | 1,307,728 | 947,695 | 792,956
Weighted Average Grant Date Fair Value Per Share |  |  |
Outstanding at beginning of year (in dollars per share) | $ 15.76 | $ 17.14 | $ 25.03
Granted (in dollars per share) | 7.95 | 16.04 | 13.60
Settled (in dollars per share) | 21.98 | 27.86 | 27.62
Cancelled/forfeited (in dollars per share) | 10.72 | 15.56 |
Outstanding at end of year (in dollars per share) | 11.16 | 15.76 | 17.14
Vested but not settled at end of year (in dollars per share) | 13.61 | 21.98 | 27.86
Unvested at end of year(in dollars per share) | $ 10.11 | $ 14.51 | $ 15.62
Expected term | 1 year | 1 year | 1 year
RSUs |  |  |
Number of Shares |  |  |
Outstanding at beginning of year (in shares) | 2,059,803 | 1,617,868 | 863,182
Granted (in shares) | 1,608,063 | 677,776 | 981,437
Settled (in shares) | (337,240) | (178,877) | (226,751)
Cancelled/forfeited (in shares) | (142,725) | (56,964) |
Outstanding at end of year (in shares) | 3,187,901 | 2,059,803 | 1,617,868
Vested but not settled at end of year (in shares) | 1,195,709 | 585,796 | 398,486
Unvested at end of year (in shares) | 1,992,192 | 1,474,007 | 1,219,382
Weighted Average Grant Date Fair Value Per Share |  |  |
Outstanding at beginning of year (in dollars per share) | $ 17.04 | $ 18.50 | $ 24.89
Granted (in dollars per share) | 8.85 | 16.54 | 14.77
Settled (in dollars per share) | 24.55 | 28.49 | 26.72
Cancelled/forfeited (in dollars per share) | 11.97 | 16.33 |
Outstanding at end of year (in dollars per share) | 12.34 | 17.04 | 18.50
Vested but not settled at end of year (in dollars per share) | 14.68 | 21.10 | 22.86
Unvested at end of year(in dollars per share) | $ 10.94 | $ 15.43 | $ 17.07
RSUs with Service Condition, weighted average grant date fair value based on share closing price |  |  |
Number of Shares |  |  |
Granted (in shares) | 1,517,675 | 74,251 | 53,991
Weighted Average Grant Date Fair Value Per Share |  |  |
Weighted average volatility estimated | 56.00% |  |
Expected term | 3 years |  |
Weighted average risk-free rate | 4.12% |  |
Share price (dollars per share) |  | $ 13.67 | $ 18.80
Remaining RSUs With Service Condition, Weighted Average Grant Date Fair Value Based on Share Closing Price |  |  |
Number of Shares |  |  |
Granted (in shares) | 90,388 |  |
Weighted Average Grant Date Fair Value Per Share |  |  |
Share price (dollars per share) | $ 11.23 |  |
RSUs with Service Condition and both Service and Market Conditions |  |  |
Number of Shares |  |  |
Granted (in shares) |  | 603,525 | 621,312
Weighted Average Grant Date Fair Value Per Share |  |  |
Weighted average volatility estimated |  | 50.00% | 48.00%
Expected term |  | 3 years | 3 years
Weighted average risk-free rate |  | 1.04% | 0.17%
RSUs With Service Condition, Weighted Average Grant Date Fair Value Based on Share Closing Price |  |  |
Number of Shares |  |  |
Granted (in shares) |  |  | 306,134
Weighted Average Grant Date Fair Value Per Share |  |  |
Weighted average volatility estimated |  |  | 54.00%
Expected term |  |  | 2 years 6 months
Weighted average risk-free rate |  |  | 0.36%

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