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Stockholders' Equity (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2021 | Jun. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Preferred stock, shares authorized |  |  | 3,000,000 | 3,000,000 |
Preferred stock, shares outstanding |  |  | 0 | 0 |
Net proceeds from sale of common stock |  |  | $ 269,893 | $ 170,792 | $ 16,248
Series C-1 Preferred Stock |  |  |  |  |
Preferred stock, shares authorized |  |  | 350,000 |  |
Preferred stock, shares outstanding |  |  | 0 | 0 |
Common Stock |  |  |  |  |
Shares issued in connection with at the market agreement (in shares) |  |  |  | 7,125,004 | 5,011,157
Net proceeds from sale of common stock |  |  |  | $ 29,400 | $ 16,200
Common stock issued (in shares) |  |  | 6,845,238 | 15,384,614 |
Aggregate gross offering price available |  |  | $ 50,000 |  |
Underwritten Public Offering |  |  |  |  |
Net proceeds from sale of common stock | $ 269,900 | $ 141,400 |  |  |
Common stock issued (in shares) | 6,845,238 | 15,384,614 |  |  |

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