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The Company and Significant Accounting Policies - Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Jan. 31, 2024 USD ($) Days $ / shares | Jul. 31, 2023 USD ($) Days $ / shares | Sep. 30, 2024 USD ($) $ / shares shares | Jun. 30, 2024 shares | Sep. 30, 2023 USD ($) $ / shares | Sep. 30, 2024 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) $ / shares | Dec. 31, 2023 shares
Restricted Stock Units |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Share-based compensation expenses | $ |  |  | $ 3.3 |  | $ 6.4 | $ 11.7 | $ 15.5 |
Total unrecognized compensation expense related to grants of restricted stock units | $ |  |  | 11.7 |  |  | $ 11.7 |  |
Weighted average period for unrecognized compensation expense related to grants of restricted stock units |  |  |  |  |  | 1 year 8 months 12 days |  |
Performance Stock Units |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Share-based compensation expenses | $ |  |  | 0.4 |  | $ 0.3 | $ 1.3 | $ 0.3 |
Total unrecognized compensation expense related to grants of restricted stock units | $ |  |  | $ 2.3 |  |  | $ 2.3 |  |
Weighted average period for unrecognized compensation expense related to grants of restricted stock units |  |  |  |  |  | 2 years 3 months 18 days |  |
Share price |  |  | $ 4.38 |  | $ 4.39 | $ 4.38 | $ 4.39 |
Number of consecutive trading days | Days | 30 | 30 |  |  |  |  |  |
Performance period commencing date | Jan. 25, 2024 | Jul. 01, 2023 |  |  |  |  |  |
Performance period ending date | Jan. 25, 2029 | Jul. 01, 2028 |  |  |  |  |  |
Weighted Average Fair Value |  |  |  |  |  | $ 3.78 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) | shares |  |  | 600,000 |  |  | 600,000 |  | 1,000,000
Share based payment award cancelled | shares |  |  |  | 300,000 |  | 300,000 |  |
Allocated percentage |  |  |  |  |  | 25.00% |  | 20.00%
Percentage of performance measurement |  |  |  |  |  | 100.00% |  |
Performance Stock Units | Tranche One |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Share price | $ 4.83 | $ 5.75 |  |  |  |  |  |
Fair value of each of the Tranches | $ | $ 0.6 | $ 0.8 |  |  |  |  |  |
Weighted Average Fair Value | $ 4.16 | $ 3.98 |  |  |  |  |  |
Performance Stock Units | Tranche Two |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Share price | $ 5.65 | $ 7.25 |  |  |  |  |  |
Fair value of each of the Tranches | $ | $ 0.6 | $ 0.7 |  |  |  |  |  |
Weighted Average Fair Value | $ 3.98 | $ 3.64 |  |  |  |  |  |
Performance Stock Units | Tranche Three |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Share price | $ 7.15 | $ 9 |  |  |  |  |  |
Fair value of each of the Tranches | $ | $ 0.5 | $ 0.7 |  |  |  |  |  |
Weighted Average Fair Value | $ 3.66 | $ 3.31 |  |  |  |  |  |
Performance Stock Units | Tranche Four |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Share price | $ 8.9 | $ 11.2 |  |  |  |  |  |
Fair value of each of the Tranches | $ | $ 0.5 | $ 0.6 |  |  |  |  |  |
Weighted Average Fair Value | $ 3.32 | $ 2.93 |  |  |  |  |  |
Performance Stock Units | Tranche Five |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Share price |  | $ 13.75 |  |  |  |  |  |
Fair value of each of the Tranches | $ |  | $ 0.5 |  |  |  |  |  |
Weighted Average Fair Value |  | $ 2.58 |  |  |  |  |  |
Minimum | Restricted Stock Units |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 1 year |  |
Minimum | Performance Stock Units |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Vesting percentage | 0.00% | 0.00% |  |  |  |  |  |
Maximum | Restricted Stock Units |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 4 years |  |
Maximum | Performance Stock Units |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Vesting percentage | 100.00% | 100.00% |  |  |  |  |  |

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