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Stock-based Compensation - Restricted Stock and Stock Options (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Shares |  |  |  |  |
Total stock-based compensation expense | $ 2,228,000 | $ 4,802,000 | $ 7,871,000 | $ 17,397,000 |
Restricted Stock Unit Awards |  |  |  |  |
Shares |  |  |  |  |
Unvested restricted stock unit awards, beginning of period (in shares) |  |  | 2,326,523 |  |
Issued (in shares) |  |  | 1,560 |  |
Vested (in shares) |  |  | (436,186) |  |
Forfeited (in shares) |  |  | (1,239,630) |  |
Unvested restricted stock unit awards, end of period (in shares) | 652,267 |  | 652,267 |  | 2,326,523
Weighted Average Grant Date Fair Value Per Share |  |  |  |  |
Balance, beginning of period (in dollars per share) |  |  | $ 9.78 |  |
Issued (in dollars per share) |  |  | 1.26 |  |
Vested (in dollars per share) |  |  | 10.30 |  |
Forfeited (in dollars per share) |  |  | 9.99 |  |
Balance, ending of period (in dollars per share) | $ 9.12 |  | $ 9.12 |  | $ 9.78
Unrecognized stock-based compensation expense | $ 3,200,000 |  | $ 3,200,000 |  |
Period for recognition |  |  | 1 year 7 months 24 days |  |
Performance Shares | Share-Based Payment Arrangement, Employee |  |  |  |  |
Shares |  |  |  |  |
Issued (in shares) |  |  | 0 |  |
Total stock-based compensation expense | 0 | $ 0 | $ 0 | $ 3,500,000 |
Stock Options |  |  |  |  |
Weighted Average Grant Date Fair Value Per Share |  |  |  |  |
Unrecognized stock-based compensation expense | $ 11,300,000 |  | $ 11,300,000 |  |
Period for recognition |  |  | 2 years 6 months |  |
Shares |  |  |  |  |
Outstanding, beginning of period (in shares) |  |  | 7,656,010 |  |
Granted (in shares) |  |  | 5,732,792 |  |
Exercised (in shares) |  |  | (12,130) |  |
Cancelled (in shares) |  |  | (4,395,961) |  |
Outstanding, end of period (in shares) | 8,980,711 |  | 8,980,711 |  | 7,656,010
Exercisable (in shares) | 3,941,705 |  | 3,941,705 |  |
Weighted Average Exercise Price |  |  |  |  |
Outstanding, beginning of period (in dollars per share) |  |  | $ 14.70 |  |
Granted (in dollars per share) |  |  | 1.74 |  |
Exercised (in dollars per share) |  |  | 1.72 |  |
Cancelled (in dollars per share) |  |  | 9.91 |  |
Outstanding, end of period (in dollars per share) | $ 8.81 |  | 8.81 |  | $ 14.70
Exercisable (in dollars per share) | $ 15.73 |  | $ 15.73 |  |
Stock Options Additional Disclosures |  |  |  |  |
Remaining contractual life (years) |  |  | 7 years 5 months 8 days |  | 7 years 2 months 8 days
Exercisable, remaining contractual life |  |  | 5 years 4 months 28 days |  |
Aggregate intrinsic value | $ 7,553,000 |  | $ 7,553,000 |  | $ 0
Exercisable, aggregate intrinsic value | $ 818,000 |  | $ 818,000 |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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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 number of grants made 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 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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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested 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)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Gross number of share options (or share units) granted during the 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)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option 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)(1)(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)(1)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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