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Stockholders' Equity (Deficit) (Narrative) (Details) $ / shares in Units, $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 09, 2022 USD ($) tranche $ / shares shares | Mar. 31, 2022 USD ($) shares | Dec. 31, 2022 shares
Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Sale of common stock, net of issuance costs (in shares) |  |  | 9,000,000
Innoviva Strategic Opportunities LLC [Member] | Securities Purchase Agreement [Member] |  |  |
Class of Stock [Line Items] |  |  |
Sale of common stock, net of issuance costs (in shares) | 9,000,000 |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 4,500,000 |  |
Exercise price of warrants | $ / shares | $ 5.00 |  |
Number of tranches | tranche | 2 |  |
Innoviva Strategic Opportunities LLC [Member] | Securities Purchase Agreement First Tranche [Member] |  |  |
Class of Stock [Line Items] |  |  |
Sale of common stock, net of issuance costs (in shares) | 3,614,792 |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 1,807,396 |  |
Proceeds from issuance of common stock and warrants | $ | $ 18.1 |  |
Innoviva Strategic Opportunities LLC [Member] | Securities Purchase Agreement Second Tranche [Member] |  |  |
Class of Stock [Line Items] |  |  |
Sale of common stock, net of issuance costs (in shares) |  | 5,385,208 |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 2,692,604 |
Proceeds from issuance of common stock and warrants | $ |  | $ 26.9 |

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