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Stock-Based Compensation Plans - Additional Information (Details) |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 48 Months Ended |
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Sep. 30, 2025 USD ($) $ / shares shares | Jul. 07, 2025 tranche $ / shares shares | Jun. 04, 2025 shares | Mar. 04, 2024 $ / shares shares | Jan. 08, 2024 | Jun. 28, 2023 shares | Aug. 01, 2021 shares | Apr. 25, 2021 shares | Jul. 31, 2019 shares | Sep. 30, 2025 USD ($) $ / shares shares | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) $ / shares shares | Sep. 30, 2024 USD ($) $ / shares | Dec. 31, 2023 shares | Sep. 30, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options repriced (in shares) |  |  |  | 3,317,596 |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, exercise price (in usd per share) | $ / shares |  |  |  | $ 1.72 |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement | $ |  |  |  |  |  |  |  |  |  |  |  | $ 1,200,000 |  |  |
Repricing cost during the period | $ |  |  |  |  |  |  |  |  |  | $ 0 | $ 86,000 | $ 100,000 | $ 1,000,000 |  |
Expected dividend yield |  |  |  | 0.00% | 0.00% |  |  |  |  |  |  | 0.00% |  |  |
Options exercisable (in shares) |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Series A Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercisable (in shares) |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Options issued (in shares) |  | 86,666,667 |  |  |  |  |  |  |  |  |  |  |  |  |
Grant-date fair value (in usd per share) | $ / shares | $ 0.326 |  |  |  |  |  |  |  |  | $ 0.326 |  | $ 0.326 |  |  |
Series B Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercisable (in shares) |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Options issued (in shares) |  | 86,666,667 |  |  |  |  |  |  |  |  |  |  |  |  |
Grant-date fair value (in usd per share) | $ / shares | 0.394 |  |  |  |  |  |  |  |  | 0.394 |  | 0.394 |  |  |
January 2024 Pre-Funded Warrants | Tranche 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercisable (in shares) |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Options issued (in shares) |  | 46,620,046 |  |  |  |  |  |  |  |  |  |  |  |  |
Grant-date fair value (in usd per share) | $ / shares | 0.013 |  |  |  |  |  |  |  |  | 0.013 |  | 0.013 |  |  |
January 2024 Pre-Funded Warrants | Tranche 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercisable (in shares) |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Options issued (in shares) |  | 46,620,046 |  |  |  |  |  |  |  |  |  |  |  |  |
Grant-date fair value (in usd per share) | $ / shares | $ 0.013 |  |  |  |  |  |  |  |  | 0.013 |  | 0.013 |  |  |
SARs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected dividend yield | 0.00% | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized (in shares) |  | 35,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercisable, ending balance (in usd per share) | $ / shares |  | $ 0.765 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of tranches | tranche |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |
Grant-date fair value (in usd per share) | $ / shares | $ 0.404 |  |  |  |  |  |  |  |  | $ 0.404 |  | $ 0.404 |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term of options (in years) |  |  |  | 4 years 7 months 28 days | 4 years 9 months 21 days |  |  |  |  |  |  |  |  |  |
Exercised (in usd per share) | $ / shares |  |  |  | $ 3.00 |  |  |  |  |  |  |  |  |  |  |
Maximum | SARs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term of options (in years) | 2 years 9 months 18 days | 2 years 10 months 24 days |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term of options (in years) |  |  |  | 1 year 7 months 28 days | 1 year 9 months 21 days |  |  |  |  |  |  |  |  |  |
Exercised (in usd per share) | $ / shares |  |  |  | $ 1.72 |  |  |  |  |  |  |  |  |  |  |
Minimum | SARs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term of options (in years) | 10 months 24 days | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |
2021 Employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum annual contributions per employee (as a percent) |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |
Purchase price of the stock, at discount from market price at purchase date (as a percent) |  |  |  |  |  |  |  | 85.00% |  |  |  |  |  |  |
Shares available for grant (in shares) |  |  |  | 1,200,000 |  |  |  | 200,000 |  |  |  |  |  |  |
Additional shares authorized (in shares) |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Shares issued under the ESPP (in shares) |  |  |  |  |  |  | 491,839 |  |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  |  |  |  |  |  |  |  | $ 22,000 | 24,000 | $ 70,000 | $ 24,000 |  |
2019 Omnibus Equity Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares available for grant (in shares) |  |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  |  |
Expected term of options (in years) |  |  |  |  |  |  |  |  |  |  |  | 5 years 10 months 28 days | 5 years 11 months 12 days |  |
Expected dividend yield |  |  |  |  |  |  |  |  |  |  |  | 0.00% | 0.00% |  |
Options granted in period, weighted-average grant date fair value (in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 0.67 | $ 0.99 |  |
Total unrecognized compensation expense | $ | $ 13,900,000 |  |  |  |  |  |  |  |  | 13,900,000 |  | $ 13,900,000 |  |  |
Period over which compensation cost will be recognized (in years) |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |
2019 Omnibus Equity Incentive Plan | Incentive stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |
2019 Omnibus Equity Incentive Plan | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term of options (in years) |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |
2019 Omnibus Equity Incentive Plan | Maximum | Non-statutory options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |
2019 Omnibus Equity Incentive Plan | Minimum | Non-statutory options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |
2019 Omnibus Equity Incentive Plan, Evergreen Provision |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional shares authorized (in shares) |  |  |  |  |  |  |  |  | 4,900,000 |  |  |  |  | 4,408,871 |
Additional shares authorized (as a percent) |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  |
Increase in other share (in shares) |  |  | 7,000,000 | 9,100,000 |  | 4,440,000 |  |  |  |  |  |  |  |  |
SARs Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  |  |  |  |  |  |  |  | 1,500,000 |  | $ 1,500,000 |  |  |
Total unrecognized compensation expense | $ | $ 7,800,000 |  |  |  |  |  |  |  |  | $ 7,800,000 |  | $ 7,800,000 |  |  |
Period over which compensation cost will be recognized (in years) |  |  |  |  |  |  |  |  |  |  |  | 1 year 3 months 21 days |  |  |
2014 Equity Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares available for grant (in shares) | 0 |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |
2017 Inducement Equity Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares available for grant (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 46,250
Share-based compensation expense | $ |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 |  |

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