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Organization and Operations - Stock Purchase Agreement and Series X Preferred Stock (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) shares | Jan. 28, 2021 | Dec. 31, 2020 shares
Stock Purchase Agreement and Series X Preferred Stock |  |  |
Net proceeds from issuance of private placement | $ | $ 104,261 |  |
Number of shares of common stock into which each share of Series X Preferred Stock may be converted | 166.67 |  |
Preferred stock, outstanding (in shares) | 0 |  | 0
Minimum |  |  |
Stock Purchase Agreement and Series X Preferred Stock |  |  |
Common stock, percentage of beneficial ownership initially, after conversion | 4.99% |  |
Common stock, percentage of beneficial ownership thereafter, after conversion | 4.99% |  |
Maximum |  |  |
Stock Purchase Agreement and Series X Preferred Stock |  |  |
Common stock, percentage of beneficial ownership initially, after conversion | 9.99% |  |
Common stock, percentage of beneficial ownership thereafter, after conversion | 19.99% |  |
Series X redeemable convertible preferred stock |  |  |
Stock Purchase Agreement and Series X Preferred Stock |  |  |
Series X Preferred Stock at Transaction Date | 88,882 |  |
Number of shares of common stock into which each share of Series X Preferred Stock may be converted | 166.67 |  |
Number of Series X preferred shares converted during period | 54,622 |  |
Number of common shares issued from conversion of Series X preferred shares | 9,103,664 |  |
Number of common shares issuable upon conversion of preferred stock (in shares) | 5,242,501 |  |
Preferred stock, outstanding (in shares) | 31,455 |  | 0
Series X redeemable convertible preferred stock | Shares issued in merger |  |  |
Stock Purchase Agreement and Series X Preferred Stock |  |  |
Series X redeemable convertible preferred stock, shares issued | 50,504 |  |
Series X redeemable convertible preferred stock | Shares issued in February 2021 Financing |  |  |
Stock Purchase Agreement and Series X Preferred Stock |  |  |
Series X redeemable convertible preferred stock, shares issued | 35,573 |  |
Series X redeemable convertible preferred stock | Warrants assumed in merger |  |  |
Stock Purchase Agreement and Series X Preferred Stock |  |  |
Series X Preferred Stock at Transaction Date | 2,805 |  |
Series X redeemable convertible preferred stock | Quellis Biosciences, Inc |  |  |
Stock Purchase Agreement and Series X Preferred Stock |  |  |
Number of shares of common stock into which each share of Series X Preferred Stock may be converted |  | 166.67 |
Series X redeemable convertible preferred stock | Quellis Biosciences, Inc | Stock Purchase Agreement |  |  |
Stock Purchase Agreement and Series X Preferred Stock |  |  |
Issuance of preferred stock in a private offering of public equity, net of issuance costs (in shares) | 35,573 |  |
Gross proceeds from issuance of preferred stock in a private offering | $ | $ 110,000 |  |
Net proceeds from issuance of private placement | $ | 104,300 |  |
Beneficial conversion feature | $ | 19,600 |  |
Issuance costs | $ | $ 5,700 |  |
Number of shares of common stock into which each share of Series X Preferred Stock may be converted | 166.67 |  |

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- Definition The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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