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Stockholders' Equity (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Preferred stock, shares authorized |  | 3,000,000 | 3,000,000 |
Preferred stock, shares outstanding |  | 0 | 0 |
Net proceeds from sale of common stock |  | $ 170,792 | $ 16,248 | $ 29,022
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 | 2,702,660
Common stock issued (in shares) |  | 15,384,614 |  |
Aggregate gross offering price available |  | $ 50,000 |  |
Underwritten Public Offering |  |  |  |
Net proceeds from sale of common stock | $ 141,400 |  |  |
Common stock issued (in shares) | 15,384,614 |  |  |

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