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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 36 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 11, 2025 USD ($) | Jul. 11, 2024 USD ($) | Jul. 11, 2023 USD ($) | Jul. 11, 2022 USD ($) | Jul. 31, 2023 shares | Sep. 30, 2025 USD ($) shares | Sep. 30, 2024 USD ($) shares | Sep. 30, 2025 USD ($) Segment shares | Sep. 30, 2024 USD ($) shares | Dec. 31, 2024 USD ($) | Jul. 11, 2025 USD ($) | Mar. 31, 2021 USD ($)
Summary Of Basis Of Presentation And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum maturity period of cash and cash equivalent |  |  |  |  |  |  |  | three months |  |  |  |
Maximum amortization period of compensation cost on straight line basis |  |  |  |  |  |  |  | 3 years |  |  |  |
Potential equivalent common stock excluded | shares |  |  |  |  |  | 2,600,000 | 5,100,000 | 2,600,000 | 5,200,000 |  |  |
Number of operating segments | Segment |  |  |  |  |  |  |  | 1 |  |  |  |
Asset acquisition equity interests issued or issuable number of shares issued | shares |  |  |  |  | 1,414,688 |  |  |  |  |  |  |
Asset acquisition percentage of outstanding ordinary shares |  |  |  |  | 11.26% |  |  |  |  |  |  |
Allowance for expected credit losses, written off | $ |  |  |  |  |  |  |  | $ 0 |  | $ 0 |  |
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] |  |  |  |  |  |  |  | President and Chief Executive Officer [Member] |  |  |  |
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description |  |  |  |  |  |  |  | The CODM uses consolidated operating margin (operating income divided by product revenue, net) and net income to assess financial performance and allocate resources. |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Basis Of Presentation And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased | shares |  |  |  |  |  | 0 | 0 | 0 | 0 |  |  |
Share Purchase Program [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Basis Of Presentation And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased | shares |  |  |  |  |  | 0 | 0 | 0 | 0 |  |  |
Share repurchase program, authorized | $ |  |  |  |  |  |  |  |  |  |  |  | $ 40,000,000
License Agreement For RUZURGI [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Basis Of Presentation And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Minimum royalty | $ | $ 3,000,000 | $ 3,000,000 | $ 3,000,000 | $ 3,000,000 |  |  |  |  |  |  | $ 3,000,000 |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Basis Of Presentation And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Advertising Expense | $ |  |  |  |  |  | $ 2,900,000 | $ 2,500,000 | $ 9,200,000 | $ 7,600,000 |  |  |
Minimum [Member] | Furniture and Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Basis Of Presentation And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Useful life of assets |  |  |  |  |  | 5 years |  | 5 years |  |  |  |
Minimum [Member] | Computer Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Basis Of Presentation And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Useful life of assets |  |  |  |  |  | 3 years |  | 3 years |  |  |  |
Minimum [Member] | Leasehold Improvements [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Basis Of Presentation And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Useful life of assets |  |  |  |  |  | 5 years |  | 5 years |  |  |  |
Maximum [Member] | Furniture and Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Basis Of Presentation And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Useful life of assets |  |  |  |  |  | 7 years |  | 7 years |  |  |  |
Maximum [Member] | Computer Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Basis Of Presentation And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Useful life of assets |  |  |  |  |  | 5 years |  | 5 years |  |  |  |
Maximum [Member] | Leasehold Improvements [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Basis Of Presentation And Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Useful life of assets |  |  |  |  |  | 10 years |  | 10 years |  |  |  |

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