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Nature of business and basis of presentation (Details) $ / shares in Units, $ in Millions | May 16, 2022 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2021 $ / shares
--- | --- | --- | ---
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.001 | $ 0.001
Cash balance | $ |  | $ 28.8 |
Atrin Pharmaceuticals, Inc |  |  |
Number of shares to purchase under option | 163,757 |  |
Common Stock | Atrin Pharmaceuticals, Inc |  |  |
Issuance of stock upon acquisition of Atrin (in shares) | 55,869 |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.001 |  |
Series A Convertible Preferred Stock | Atrin Pharmaceuticals, Inc |  |  |
Issuance of stock upon acquisition of Atrin (in shares) | 2,949,630 |  |
Conversion value | $ | $ 68.8 |  |
Preferred stock conversion ratio | 10 |  |

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