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Financial Instruments - Warrant liability (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Jun. 02, 2021 | Jan. 28, 2021
Derivative warrant liability was valued based on significant inputs not observable in the market, which represents a Level 3 |  |  |
Beginning balance | $ 0 |  |
Issuance of warrant | 4,332 |  |
(Decrease) increase in the fair value of the warrants | (864) |  |
Reclassification of warrant liability to additional paid-in capital | (3,468) |  |
Ending balance | $ 0 |  |
Common stock |  |  |
Financial Instruments |  |  |
Number of shares which may be purchased with warrants |  | 467,500 |
Exercise price of warrants (in dollars per share) |  | $ 2.10 |
Quellis Biosciences, Inc | Series X redeemable convertible preferred stock |  |  |
Financial Instruments |  |  |
Number of shares which may be purchased with warrants |  |  | 2,805
Exercise price of warrants (in dollars per share) |  |  | $ 341.70
Quellis Biosciences, Inc | Common stock |  |  |
Financial Instruments |  |  |
Number of shares which may be purchased with warrants |  |  | 30,856
Exercise price of warrants (in dollars per share) |  |  | $ 2.10

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