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Nature of Business (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 28, 2021 | Jan. 31, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | May 31, 2020
Liquidity |  |  |  |  |  |  |
Number of common stock issued |  |  | 6,900,000 |  |  |  |
Proceeds from offering of common stock, net of issuance costs |  |  | $ 203,700 | $ 203,726 | $ 116,341 | $ 76,789 |
Accumulated deficit |  |  |  | 665,197 | $ 549,221 |  |
At Market Offering | Cowen and Company LLC ("Cowen") |  |  |  |  |  |  |
Liquidity |  |  |  |  |  |  |
Sales agreement amount of aggregate sale proceeds of common stock agreed to be issued |  |  |  |  |  |  | $ 150,000
Overallotment Option |  |  |  |  |  |  |
Liquidity |  |  |  |  |  |  |
Number of common stock issued |  |  | 900,000 |  |  |  |
Overallotment Option | Subsequent Event |  |  |  |  |  |  |
Liquidity |  |  |  |  |  |  |
Proceeds from offering of common stock, net of issuance costs | $ 32,600 |  |  |  |  |  |
Public and Market Offering |  |  |  |  |  |  |
Liquidity |  |  |  |  |  |  |
Aggregate net proceeds |  |  |  | $ 648,700 |  |  |
Public Offering | Subsequent Event |  |  |  |  |  |  |
Liquidity |  |  |  |  |  |  |
Number of common stock issued |  | 3,500,000 |  |  |  |  |
Proceeds from offering of common stock, net of issuance costs |  | $ 216,900 |  |  |  |  |

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