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Stock-based Compensation - Award Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Exercisable and Expected to Vest |  |  |
Options exercisable (in shares) | 2,231,000 |  |
Options vested and expected to vest (in shares) | 4,748,000 |  |
Options exercisable (in dollars per share) | $ 8.61 |  |
Options vested and expected to vest (in dollars per share) | $ 7.42 |  |
Weighted average remaining contractual terms, exercisable options | 3 years 7 months 6 days |  |
Weighted average remaining contractual terms, vested and expected to vest options | 6 years 4 months 24 days |  |
Aggregate intrinsic value, exercisable options | $ 79 |  |
Aggregate intrinsic value, options vested and expected to vest | $ 170 |  |
RSAs |  |  |
Number of Shares |  |  |
Non-vested, beginning of period (in shares) | 181,000 | 80,000 | 96,000
Granted (in shares) | 277,000 | 159,000 | 46,000
Vested (in shares) | (133,000) | (58,000) | (62,000)
Non-vested, end of period (in shares) | 325,000 | 181,000 | 80,000
Weighted Average Grant Date Fair Value Per Share |  |  |
Non-vested, beginning of period (in dollars per share) | $ 8.45 | $ 17.53 | $ 11.44
Granted (in dollars per share) | 2.89 | 7.53 | 21.91
Vested (in dollars per share) | 9.04 | 18.42 | 11.31
Non-vested, end of period (in dollars per share) | $ 3.48 | $ 8.45 | $ 17.53
RSUs |  |  |
Number of Shares |  |  |
Non-vested, beginning of period (in shares) | 518,000 | 232,000 | 176,000
Granted (in shares) | 1,049,000 | 518,000 | 163,000
Vested (in shares) | (204,000) | (106,000) | (70,000)
Forfeited/Expired (in shares) | (343,000) | (126,000) | (37,000)
Non-vested, end of period (in shares) | 1,020,000 | 518,000 | 232,000
Weighted Average Grant Date Fair Value Per Share |  |  |
Non-vested, beginning of period (in dollars per share) | $ 18.15 | $ 21.83 | $ 14.17
Granted (in dollars per share) | 5.24 | 17.46 | 26.59
Vested (in dollars per share) | 18.42 | 21.21 | 13.57
Forfeited/Expired (in dollars per share) | 9.71 | 19.55 | 21.89
Non-vested, end of period (in dollars per share) | $ 7.66 | $ 18.15 | $ 21.83
PSUs |  |  |
Number of Shares |  |  |
Non-vested, beginning of period (in shares) | 667,000 | 128,000 | 131,000
Granted (in shares) |  | 686,000 | 82,000
Vested (in shares) | (315,000) | (107,000) | (66,000)
Forfeited/Expired (in shares) | (75,000) | (40,000) | (19,000)
Other (in shares) | 15,000 |  |
Non-vested, end of period (in shares) | 292,000 | 667,000 | 128,000
Weighted Average Grant Date Fair Value Per Share |  |  |
Non-vested, beginning of period (in dollars per share) | $ 9.41 | $ 21.24 | $ 15.34
Granted (in dollars per share) |  | 9.55 | 26.16
Vested (in dollars per share) | 11.02 | 20.52 | 16.14
Forfeited/Expired (in dollars per share) | 12.49 | 19.93 | 19.38
Other (in dollars per share) | 25.05 |  |
Non-vested, end of period (in dollars per share) | $ 7.69 | $ 9.41 | $ 21.24
PBOs |  |  |
Number of Shares |  |  |
Non-vested, beginning of period (in shares) | 1,826,000 | 1,840,000 | 1,560,000
Granted (in shares) | 0 | 733,000 | 433,000
Forfeited/Expired (in shares) | (178,000) | (747,000) | (118,000)
Non-vested, end of period (in shares) | 1,648,000 | 1,826,000 | 1,840,000
Weighted Average Grant Date Fair Value Per Share |  |  |
Non-vested, beginning of period (in dollars per share) | $ 4.70 | $ 4.11 | $ 5.05
Granted (in dollars per share) |  | 9.89 | 12.23
Forfeited/Expired (in dollars per share) | 9.73 | 8.29 | 12.23
Non-vested, end of period (in dollars per share) | $ 5.64 | $ 4.70 | $ 4.11
Exercisable and Expected to Vest |  |  |
Options exercisable (in shares) | 1,627,000 |  |
Options vested and expected to vest (in shares) | 1,646,000 |  |
Options exercisable (in dollars per share) | $ 10.96 |  |
Options vested and expected to vest (in dollars per share) | $ 11.06 |  |
Weighted average remaining contractual terms, exercisable options | 4 years 4 months 24 days |  |
Weighted average remaining contractual terms, vested and expected to vest options | 4 years 6 months |  |
Aggregate intrinsic value, exercisable options | $ 0 |  |
Aggregate intrinsic value, options vested and expected to vest | $ 0 |  |
PBOs |  |  |
Number of Shares |  |  |
Exercised (in shares) |  |  | (35,000)
Weighted Average Grant Date Fair Value Per Share |  |  |
Exercised (in dollars per share) |  |  | $ 9.02

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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