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Stockholders' Equity - Common Stock (Details) | Jun. 30, 2021 Vote shares | Dec. 31, 2020 shares | Aug. 31, 2018 $ / shares shares
--- | --- | --- | ---
Class of Stock [Line Items] |  |  |
Common shares, shares issued (in shares) | 243,076 | 243,076 |
Common shares, votes per share | Vote | 1 |  |
RA Capital Healthcare Fund, L.P |  |  |
Class of Stock [Line Items] |  |  |
Common shares, shares issued (in shares) |  |  | 241,467
Share price | $ / shares |  |  | $ 0.0012

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