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Description of Business and Summary of Significant Accounting Policies - Additional Information (Details) |  | 12 Months Ended |
--- | --- | --- | ---
May 13, 2024 USD ($) | Mar. 31, 2024 USD ($) Compounds shares | Mar. 31, 2023 USD ($) shares | May 29, 2024 USD ($)
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Cash and cash equivalents |  | $ 2,901,000 | $ 15,301,000 |
Restricted cash |  | 143,000 | 143,000 |
Accumulated deficit |  | (339,669,000) | (324,998,000) |
Cash flow from operations |  | $ 14,653,000 | $ 12,408,000 |
Issuance of common stock | shares |  | 10,077,726 | 8,716,906 |
Proceeds from sale of common stock shares |  | $ 1,437,000 | $ 0 |
Restricted cash |  | $ 100,000 | 100,000 |
Inventory finished goods |  |  | 0 |
Estimated useful life of the fixed assets |  | The estimated useful lives of the fixed assets range between one and seven years. |  |
Impairment of long-lived assets |  | $ 0 | 0 |
Acquired in-process research and development accrued expenses |  | 0 | 2,000,000 |
Dilutive effect |  | $ 0 | $ 0 |
Common stock equivalents excluded from computing diluted net loss per share | shares |  | 800,000 | 1,600,000 |
Subsequent Event [Member] |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Cash and cash equivalents |  |  |  | $ 7,000,000
Maximum [Member] |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Maturity of highly liquid investment |  | 3 months |  |
Useful life of fixed assets, range |  | 7 years |  |
Minimum [Member] |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Useful life of fixed assets, range |  | 1 year |  |
Mosaic Cell Sciences [Member] |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Inventory finished goods |  | $ 0.3 |  |
At-The-Market Facility [Member] |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Issuance of common stock | shares |  | 1,172,342 |  |
Public Offering [Member] | Subsequent Event [Member] |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Net proceeds from issuance of offerings | $ 4,700,000 |  |  |
Metacrine's FXR Program [Member] |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Number of clinically tested compounds | Compounds |  | 2 |  |
Number of discovery or preclinical compounds | Compounds |  | 2,000 |  |
Metacrine, Inc. [Member] | Metacrine's FXR Program [Member] |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Asset Acquisition, Price of Acquisition, Expected |  |  | $ 4,000,000 |
Upfront payment paid |  |  | $ 2,000,000 |
Acquired in-process research and development accrued expenses |  | $ 2,000,000 |  |

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