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Organization and Operations - Stock Purchase Agreement and Series X Preferred Stock (Details) - USD ($) $ in Thousands |  |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 02, 2021 | Jan. 28, 2021 | Jun. 30, 2021 | Feb. 28, 2021 | Dec. 31, 2020
Stock Purchase Agreement and Series X Preferred Stock |  |  |  |  |  |
Net proceeds from issuance of private placement |  |  |  | $ 104,261 |  |
Series X Preferred Stock at Transaction Date |  |  |  |  | 88,882 |
Common Stock Issuable Upon Conversion at Transaction Date |  |  |  |  | 88,882,000 |
Percentage of beneficial ownership initially, after conversion | 9.99% |  |  | 9.99% |  |
Minimum |  |  |  |  |  |
Stock Purchase Agreement and Series X Preferred Stock |  |  |  |  |  |
Percentage of beneficial ownership thereafter, after conversion | 4.99% |  |  | 4.99% |  |
Maximum |  |  |  |  |  |
Stock Purchase Agreement and Series X Preferred Stock |  |  |  |  |  |
Percentage of beneficial ownership thereafter, after conversion | 19.99% |  |  | 19.99% |  |
Quellis Biosciences, Inc | Stock Purchase Agreement |  |  |  |  |  |
Stock Purchase Agreement and Series X Preferred Stock |  |  |  |  |  |
Beneficial conversion feature |  |  |  | $ 19,600 |  |
Series X redeemable convertible preferred stock |  |  |  |  |  |
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 |  |
Number of shares of common stock into which each share of Series X Preferred Stock may be converted |  | 1,000 |  | 1,000 |  |
Conversion of preferred stock into common stock (in shares) | 53,532 |  |  |  |  |
Issuance of common stock upon the conversion of preferred stock (in shares) | 53,531,797 |  |  |  |  |
Preferred stock, outstanding (in shares) | 32,545 |  |  | 32,545 |  | 0
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 |  |  | 1,000 |  |  |
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 |  |
Issuance costs |  |  |  | $ 5,700 |  |
Outstanding shares issued in merger |  |  |  |  |  |
Stock Purchase Agreement and Series X Preferred Stock |  |  |  |  |  |
Series X Preferred Stock at Transaction Date |  |  |  |  | 50,504 |
Common Stock Issuable Upon Conversion at Transaction Date |  |  |  |  | 50,504,000 |
Outstanding shares issued in February 2021 Financing |  |  |  |  |  |
Stock Purchase Agreement and Series X Preferred Stock |  |  |  |  |  |
Series X Preferred Stock at Transaction Date |  |  |  |  | 35,573 |
Common Stock Issuable Upon Conversion at Transaction Date |  |  |  |  | 35,573,000 |
Warrants assumed in merger |  |  |  |  |  |
Stock Purchase Agreement and Series X Preferred Stock |  |  |  |  |  |
Series X Preferred Stock at Transaction Date |  |  |  |  | 2,805 |
Common Stock Issuable Upon Conversion at Transaction Date |  |  |  |  | 2,805,000 |

X
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