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Public Offering of Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Net proceeds from public offering |  | $ 0 | $ 0 | $ 100,870
Public Offering |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Public offering of common stock (in shares) | 6,325,000 |  |  |
Public offering of common stock (in dollars per shares) | $ 17.00 |  |  |
Net proceeds from public offering | $ 100,900 |  |  |
Over-Allotment Option |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Public offering of common stock (in shares) | 825,000 |  |  |

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