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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 25, 2025 | Aug. 05, 2024 | May 13, 2024 | May 08, 2024 | Sep. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Mar. 31, 2025
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  | $ 6,677,000 | $ 6,677,000 | $ 6,677,000 | $ 3,174,000 | $ 11,312,000
Restricted cash |  |  |  |  | 143,000 | 143,000 | 143,000 | 143,000 | 143,000
Accumulated deficit |  |  |  |  | (347,545,000) | (347,545,000) | (347,545,000) |  | (342,157,000)
Cash flow from operations |  |  |  |  |  |  | 6,318,000 | 5,625,000 |
Total current assets |  |  |  |  | 7,591,000 | 7,591,000 | 7,591,000 |  | 12,131,000
Total current liabilities |  |  |  |  | 2,449,000 | 2,449,000 | 2,449,000 |  | $ 3,737,000
Working capital |  |  |  |  | $ 5,200,000 | $ 5,200,000 | $ 5,200,000 |  |
Issuance of common stock |  |  |  |  | 2,607,962 | 2,607,962 | 2,607,962 |  | 1,898,068
Escrow receivable |  |  |  |  | $ 1,008,000 | $ 1,008,000 | $ 1,008,000 |  | $ 1,000,000
Period of escrow | 15 months |  |  |  |  |  |  |  |
Initial offering date |  |  |  | May 8, 2024 |  |  |  |  |
Insurance premium financing liability |  |  |  |  | 352,000 | 352,000 | 352,000 |  | 128,000
Dilutive effect |  |  |  |  |  |  | $ 0 | $ 0 |
Common stock equivalents excluded from computing diluted net loss per share |  |  |  |  |  |  | 700,000 | 900,000 |
Minimum percentage of income tax payment net of refunds received |  |  |  |  |  |  | 5.00% |  |
Insurance Premium Financing Liability [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Insurance premium financing agreement description |  |  |  |  |  |  | In September 2025, the Company entered into an insurance premium financing agreement for $0.4 million, with a term of nine months and an annual interest rate of 7.82%. The Company made a down payment of 10% and is required to make monthly principal and interest payments of $40,468 over the term of the agreement, which will mature in June 2026. |  |
Financing agreement amount |  |  |  |  | $ 400,000 | 400,000 | $ 400,000 |  |
Annual interest rate |  |  |  |  | 7.82% |  |  |  |
Percentage of down payment |  |  |  |  | 10.00% |  |  |  |
Monthly principal and interest payments |  |  |  |  | $ 40,468 |  |  |  |
Prepaid insurance included in prepaid expenses and other current assets |  |  |  |  | $ 400,000 | $ 400,000 | $ 400,000 |  | 200,000
Common Warrants [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  | 416,666 |  |  |  |  |
Issuance of warrants |  | 130,202 |  | 130,202 |  |  |  |  |
Stock offering price per share |  | $ 9.6 |  | $ 9.6 |  |  |  |  |
Pre-Funded Warrants [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Stock offering price per share |  | $ 9.588 |  | $ 9.588 |  |  |  |  |
At-The-Market Facility [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  | 701,729 | 701,729 | 701,729 |  |
Net proceeds from issuance of offerings |  |  |  |  |  |  | $ 1,800,000 |  |
Issuance of common stock |  |  |  |  |  | 0 | 701,729 |  |
Public Offering [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Net proceeds from issuance of offerings |  |  | $ 4,500,000 |  |  |  |  |  |
Issuance of common stock |  |  |  | 130,202 |  |  |  |  |
Public Offering [Member] | Common Warrants [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Issuance of common stock |  | 416,666 |  |  |  |  |  |  |
Public Offering [Member] | Common Warrants [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Issuance of warrants |  | 416,666 |  | 416,666 |  |  |  |  |
Metacrine, Inc. [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Upfront payment | $ 10,000,000 |  |  |  |  |  |  |  |
Closing upfront payment | 9,000,000 |  |  |  |  |  |  |  |
Escrow receivable | 1,000,000 |  |  |  |  |  |  |  |
Metacrine's FXR Program [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Future milestone |  |  |  |  |  |  | $ 50,000,000 |  |
Metacrine's FXR Program [Member] | Metacrine, Inc. [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Upfront payment | 10,000,000 |  |  |  |  |  |  |  |
Closing upfront payment | 9,000,000 |  |  |  |  |  |  |  |
Escrow receivable |  |  |  |  |  |  |  |  | $ 1,000,000
Future milestone | $ 50,000,000 |  |  |  |  |  |  |  |

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